diff --git a/configure.ac b/configure.ac
index 6c2b2a7ea8b..afa508ca556 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,1354 +1,1354 @@
-dnl Init.
-AC_INIT(dosbox-x,2023.10.06,[https://github.com/joncampbell123/dosbox-x/issues],[],[https://dosbox-x.com])
-AC_PREREQ(2.60)
-AC_CONFIG_SRCDIR(README.md)
-
-dnl Utility function ============================
-
-# AC_CHECK_CPPFLAGS(ADDITIONAL-CPPFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
-#
-# checks whether the $(C) compiler accepts the ADDITIONAL-CPPFLAGS
-# if so, they are added to the CPPFLAGS
-AC_DEFUN([AC_CHECK_CPPFLAGS],
-[
-  AC_MSG_CHECKING([whether $CPP accepts "$1"])
-  temp_check_cppflags="${CPPFLAGS}"
-  CPPFLAGS="$1 ${CPPFLAGS}"
-  AC_PREPROC_IFELSE(
-        [AC_LANG_SOURCE([[int main(void){return 0;}]])],
-        [AC_MSG_RESULT([yes])],
-        [AC_MSG_RESULT([no]); CPPFLAGS="${temp_check_cppflags}"])
-])# AC_CHECK_CPPFLAGS
-
-dnl LIBRARY TEST: OpenGL support
-AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
-AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
-AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )
-
-dnl LIBRARY TEST: Direct3D 9 header support
-AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
-AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )
-
-dnl Utility function ============================
-
-# AC_CHECK_CXXFLAGS(ADDITIONAL-CXXFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
-#
-# checks whether the $(CXX) (c++) compiler accepts the ADDITIONAL-CXXFLAGS
-# if so, they are added to the CXXFLAGS
-AC_DEFUN([AC_CHECK_CXXFLAGS],
-[
-  AC_MSG_CHECKING([whether $CXX accepts "$1"])
-cat > conftest.c++ << EOF
-int main(){
-  return 0;
-}
-EOF
-if $CXX $CPPFLAGS $CXXFLAGS -Werror -c -o conftest.o conftest.c++ [$1] > /dev/null 2>&1
-then
-  AC_MSG_RESULT([yes])
-  CXXFLAGS="${CXXFLAGS} [$1]"
-  AC_CHECK_CPPFLAGS([$1])
-  [$2]
-else
-  AC_MSG_RESULT([no])
-  [$3]
-fi
-])# AC_CHECK_CXXFLAGS
-
-dnl End Utility function ============================
-
-dnl Detect the canonical host and target build environment
-AC_CANONICAL_HOST
-AC_CANONICAL_BUILD
-
-dnl Setup for automake
-AM_INIT_AUTOMAKE([foreign subdir-objects])
-AC_CONFIG_HEADER(config.h)
-AH_BOTTOM([/*
-  Define HAS_CDIRECTLPT as 1 if C_DIRECTLPT is defined (as 1) *and* parallel
-  pass-through is available on the current platform. It is only available on
-  x86{_64} with Windows or BSD, and on Linux.
-  We cannot override the value of C_DIRECTLPT, because configure will replace
-  "#undef C_DIRECTLPT" or "#define C_DIRECTLPT 0" with "#define C_DIRECTLPT 1".
-*/
-#ifdef C_DIRECTLPT
-#if ((defined __i386__ || defined __x86_64__ || defined _M_IX86 || defined _M_X64) && \
-     (defined WIN32 || defined BSD || defined __CYGWIN__)) || \
-     /* WIN32 is not defined by default on Cygwin */ \
-    defined LINUX /* Linux, including non-x86 (e.g. Raspberry Pi) */
-#define HAS_CDIRECTLPT 1
-#endif
-#endif // C_DIRECTLPT
-#ifndef HAS_CDIRECTLPT
-#define HAS_CDIRECTLPT 0
-#endif])
-
-dnl Checks for programs.
-AC_PROG_MAKE_SET
-AC_PROG_CC
-AC_PROG_CPP
-AC_PROG_CXX
-AC_PROG_OBJCXX
-AC_PROG_INSTALL
-AC_CHECK_TOOL(AR, ar)
-AC_PROG_RANLIB
-AC_PREFIX_DEFAULT([/usr/local])
-
-dnl this code needs large file support on 32-bit systems
-AC_SYS_LARGEFILE
-
-#Check for big endian machine, should #define WORDS_BIGENDIAN if so
-AC_C_BIGENDIAN
-
-dnl Checks for typedefs, structures, and compiler characteristics.
-AC_C_CONST
-AC_C_INLINE
-AC_TYPE_SIZE_T
-AC_STRUCT_TM
-
-dnl some semi complex check for sys/socket so it works on darwin as well
-AC_CHECK_HEADERS([stdlib.h sys/types.h])
-AC_CHECK_HEADERS([sys/socket.h  netinet/in.h pwd.h], [], [],
-[#include <stdio.h>
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#else
-# ifdef HAVE_STDLIB_H
-#  include <stdlib.h>
-# endif
-#endif
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-])
-
-dnl C++11 is mandatory in this codebase.
-dnl C++14 is optional at this time, will eventually become mandatory.
-
-dnl AC_CHECK_CXXFLAGS will prepend gnu++11 to CXXFLAGS if supported, for us.
-OLDCFLAGS="$CFLAGS"
-OLDCPPFLAGS="$CPPFLAGS"
-OLDCXXFLAGS="$CXXFLAGS"
-
-AC_MSG_CHECKING([checking for C++14 support])
-AC_CHECK_CXXFLAGS([ -std=gnu++14 ], [  ], [
-    warn_cpp11=1
-])
-
-CXXFLAGS="$OLDCXXFLAGS"
-CPPFLAGS="$OLDCPPFLAGS"
-CFLAGS="$OLDCFLAGS"
-
-AC_MSG_CHECKING([checking for C++11 support])
-AC_CHECK_CXXFLAGS([ -std=gnu++11 ], [  ], [
-    warn_cpp0x=1
-])
-
-CXXFLAGS="$OLDCXXFLAGS"
-CPPFLAGS="$OLDCPPFLAGS"
-CFLAGS="$OLDCFLAGS"
-
-if test x$warn_cpp0x = x1; then
-    AC_MSG_ERROR([ Your compiler must support C++11 or better ])
-fi
-
-dnl Allow devs to force compile as C++11 as long as this code supports C++11 as a baseline
-AC_ARG_ENABLE(force-cxx11,AC_HELP_STRING([--enable-force-cxx11],[Force compile as C++11]),force_cxx11=yes)
-
-if test x$warn_cpp11 = x1; then
-    AC_MSG_WARN([ Your compiler does not support C++14. Currently it is optional. At some point in the future, it will be required ])
-    CFLAGS="$CFLAGS -std=gnu11";
-    CXXFLAGS="$CXXFLAGS -std=gnu++11";
-elif test x$force_cxx11 = xyes; then
-    CFLAGS="$CFLAGS -std=gnu11";
-    CXXFLAGS="$CXXFLAGS -std=gnu++11";
-else
-    AC_MSG_WARN([ DOSBox-X is still intended to support compilation as C++11. If you add new code please make sure it works as C++11 by running ./configure with --enable-force-cxx11 ])
-    CFLAGS="$CFLAGS -std=gnu11"; # no such "gnu14"
-    CXXFLAGS="$CXXFLAGS -std=gnu++14";
-fi
-
-dnl Allow the SDL drawn menu to be enabled on Windows or macOS instead of their native menu system.
-AH_TEMPLATE(C_FORCE_MENU_SDLDRAW,[Define to 1 to force SDL-drawn menus])
-AC_ARG_ENABLE(force-menu-sdldraw,AC_HELP_STRING([--enable-force-menu-sdldraw],[Force SDL drawn menus]),enable_force_menu_sdldraw=yes)
-
-dnl This is how the build script can specify a HX DOS extender target
-AH_TEMPLATE(C_HX_DOS,[Define to 1 to target HX DOS])
-AC_ARG_ENABLE(hx-dos,AC_HELP_STRING([--enable-hx-dos],[Enable HX target]),enable_hx=yes)
-
-dnl This is how the build script can use libopencow for win9x unicode 
-# AH_TEMPLATE(C_OPENCOW,[Define to 1 to enable opencow])
-AC_ARG_ENABLE(opencow,AC_HELP_STRING([--enable-opencow],[Enable OpenCOW]),enable_opencow=yes)
-
-dnl Disable SDLnet for win9x builds
-AC_ARG_ENABLE(sdlnet,AC_HELP_STRING([--disable-sdlnet],[Disable SDLNet]),disable_sdl_net=yes)
-
-dnl Let me know if you're targeting Emscripten
-AH_TEMPLATE(C_EMSCRIPTEN,[Define to 1 to target Emscripten])
-AC_ARG_ENABLE(emscripten,AC_HELP_STRING([--enable-emscripten],[Enable Emscripten target]),enable_emscripten=$enableval,enable_emscripten=no)
-
-dnl Allow disabling X11 integration if your platform doesn't support it
-AC_ARG_ENABLE(x11,AC_HELP_STRING([--disable-x11],[Don't enable X11 integration]))
-
-dnl Optimize for speed by default
-AC_ARG_ENABLE(optimize,AC_HELP_STRING([--disable-optimize],[Don't enable compiler optimizations]))
-
-dnl FIXME: Remove default "-O2" set by some autotools versions. TODO: check availability of sed.
-CFLAGS=["`echo $CFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]
-CXXFLAGS=["`echo $CXXFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]
-
-if test x$enable_optimize != xno; then
-    if test x$enable_emscripten = xyes; then
-	    CFLAGS="$CFLAGS -Os"
-	    CXXFLAGS="$CXXFLAGS -Os"
-    else
-	    CFLAGS="$CFLAGS -O2"
-	    CXXFLAGS="$CXXFLAGS -O2"
-    fi
-fi
-
-if test x$enable_emscripten = xyes; then
-	AC_DEFINE(C_EMSCRIPTEN,1,[Targeting Emscripten])
-  AC_DEFINE(C_DIRECTSERIAL, 0, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-fi
-
-dnl Some stuff for the icon.
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-    if test x$enable_hx = xyes; then
-        CXXFLAGS="$CXXFLAGS -DHX_DOS"
-        AC_DEFINE(C_HX_DOS,1,[Targeting HX DOS extender])
-    fi
-    ;;
-esac
-
-if test x$enable_force_menu_sdldraw = xyes; then
-    CXXFLAGS="$CXXFLAGS -DFORCE_SDLDRAW"
-    AC_DEFINE(C_FORCE_MENU_SDLDRAW,1,[Force SDL drawn menus])
-fi
-
-dnl TEST: Environ can be included
-AC_MSG_CHECKING(if environ can be included)
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-#include <unistd.h>
-#include <stdlib.h>]],[[*environ;]])],
-[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_INCLUDED,1,[environ can be included])],AC_MSG_RESULT(no))
-
-dnl TEST: Environ can be linked
-AC_MSG_CHECKING(if environ can be linked)
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char ** environ;]],[[*environ;]])],
-[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_LINKED,1,[environ can be linked])],AC_MSG_RESULT(no))
-
-dnl TEST: dirent includes d_type
-AC_MSG_CHECKING([if dirent includes d_type])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([
-#include <sys/types.h>
-#include <dirent.h>
-void blah(){
-struct dirent d_test;
-d_test.d_type = 0;
-}])],[AC_MSG_RESULT(yes);AC_DEFINE(DIRENT_HAS_D_TYPE,1,[struct dirent has d_type])],AC_MSG_RESULT(no))
-
-dnl TEST: Check for powf
-AC_MSG_CHECKING(for powf in libm);
-LIBS_BACKUP=$LIBS;
-LIBS="$LIBS -lm";
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],[[
-        powf(1.0f, 1.0f);
-]])], [AC_MSG_RESULT(yes)], [AC_DEFINE([DB_HAVE_NO_POWF],[1],[libm does not include powf])])
-LIBS=$LIBS_BACKUP
-
-dnl Look for clock_gettime, a DB_HAVE_CLOCK_GETTIME is set when present
-AH_TEMPLATE([DB_HAVE_CLOCK_GETTIME],[Determines if the function clock_gettime is available.])
-AC_SEARCH_LIBS([clock_gettime], [rt] , [found_clock_gettime=yes], [found_clock_gettime=no])
-if test x$found_clock_gettime = xyes; then
-  AC_DEFINE(DB_HAVE_CLOCK_GETTIME)
-fi
-
-dnl TEST: Check if the compiler support attributes
-AH_TEMPLATE([C_HAS_ATTRIBUTE],[Determines if the compilers supports attributes for structures.])
-AC_MSG_CHECKING(if compiler allows __attribute__)
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-typedef struct { } __attribute__((packed)) junk;]],
-[[ ]])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_ATTRIBUTE)],AC_MSG_RESULT(no))
-
-dnl TEST: Check if the compiler supports certain attributes
-OLDCFLAGS="$CFLAGS"
-CFLAGS="-Werror"
-
-AH_TEMPLATE([C_ATTRIBUTE_ALWAYS_INLINE],[Determines if the compilers supports always_inline attribute.])
-AC_MSG_CHECKING(if compiler allows __attribute__((always_inline)) )
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([ inline void __attribute__((always_inline)) test(){}
-])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_ALWAYS_INLINE)],AC_MSG_RESULT(no))
-
-AH_TEMPLATE([C_ATTRIBUTE_FASTCALL],[Determines if the compilers supports fastcall attribute.])
-AC_MSG_CHECKING(if compiler allows __attribute__((fastcall)) )
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([ void __attribute__((fastcall)) test(){}
-])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_FASTCALL)],AC_MSG_RESULT(no))
-
-CFLAGS="$OLDCFLAGS"
-
-dnl TEST: Check if the compiler supports __builtin_expect
-#Switch language to c++
-AC_LANG_PUSH(C++)
-AH_TEMPLATE([C_HAS_BUILTIN_EXPECT],[Determines if the compilers supports __builtin_expect for branch prediction.])
-AC_MSG_CHECKING(if compiler allows __builtin_expect)
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[
-int x=10;if( __builtin_expect ((x==1),0) ) ;
-]])], [ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_BUILTIN_EXPECT)],AC_MSG_RESULT(no))
-#switch language back
-AC_LANG_POP(C++)
-
-dnl Check for mach_vm_remap (Darwin)
-AH_TEMPLATE(C_HAVE_MACH_VM_REMAP,[Define to 1 if you have the mach_vm_remap function])
-AC_CHECK_HEADER([mach/mach.h], [
-AC_CHECK_FUNC([mach_vm_remap],[AC_DEFINE(C_HAVE_MACH_VM_REMAP,1)])
-])
-
-dnl Check for mprotect. Needed for 64 bits linux 
-AH_TEMPLATE(C_HAVE_MPROTECT,[Define to 1 if you have the mprotect function])
-AC_CHECK_HEADER([sys/mman.h], [
-AC_CHECK_FUNC([mprotect],[AC_DEFINE(C_HAVE_MPROTECT,1)])
-])
-
-dnl Check for memfd_create, for dynamic core. You need the glibc version, not just the syscall.
-AH_TEMPLATE(C_HAVE_MEMFD_CREATE,[Define to 1 if you have the memfd_create function])
-AC_CHECK_HEADER([sys/mman.h], [
-AC_CHECK_FUNC([memfd_create],[AC_DEFINE(C_HAVE_MEMFD_CREATE,1)])
-])
-
-dnl Check for posix_memalign
-AH_TEMPLATE(C_HAVE_POSIX_MEMALIGN,[Define to 1 if you have the posix_memalign function])
-AC_CHECK_HEADER([stdlib.h], [
-AC_CHECK_FUNC([posix_memalign],[AC_DEFINE(C_HAVE_POSIX_MEMALIGN,1)])
-])
-
-dnl Check for mmap
-AH_TEMPLATE(C_HAVE_MMAP,[Define to 1 if you have the mmap function])
-AC_CHECK_HEADER([sys/mman.h], [
-AC_CHECK_FUNC([mmap],[AC_DEFINE(C_HAVE_MMAP,1)])
-])
-
-dnl Check for realpath. Used on Linux
-AC_CHECK_FUNCS([realpath])
-
-dnl Setpriority
-AH_TEMPLATE(C_SET_PRIORITY,[Define to 1 if you have setpriority support])
-AC_MSG_CHECKING(for setpriority support)
-AC_LINK_IFELSE([AC_LANG_SOURCE([
-#include <sys/resource.h>
-int main(int argc,char **argv) {
-	return setpriority (PRIO_PROCESS, 0,PRIO_MIN+PRIO_MAX);
-};
-])],AC_MSG_RESULT(yes);AC_DEFINE(C_SET_PRIORITY,1),AC_MSG_RESULT(no))
-
-dnl Some target detection and actions for them
-case "$host" in
-    *-*-darwin* | *-*-openbsd*)
-       dnl El Capitan's refusal to allow sudo make install to /usr/include, and the failure of most open source to
-       dnl include from /usr/local/include is irritating and tiresome...
-       CFLAGS="$CFLAGS -I/usr/local/include"
-       CPPFLAGS="$CPPFLAGS -I/usr/local/include"
-       ;;
-esac
-
-if test x$enable_emscripten = xyes; then
-    CXXFLAGS="$CXXFLAGS"
-else
-    dnl Some default CPU flags
-    case "$host_cpu" in
-        x86_64 | amd64)
-        # SSE is part of the x86_64 ABI
-        CXXFLAGS="$CXXFLAGS -msse"
-        ;;
-    esac
-fi
-
-dnl Some needed libaries for OS2
-dnl perharps join this with the other target depended checks. move them upwards
-if test x$host = xi386-pc-os2-emx ; then
-    CXXFLAGS="$CXXFLAGS -Zmt"
-    LDFLAGS="$LDFLAGS -Zomf -Zmt"
-fi
-
-dnl I would like to know of any concerns given by the C++ compiler.
-dnl Clang/LLVM already does this to some degree, let's get GCC to do it too.
-AC_CHECK_CXXFLAGS([ -Wall ])
-AC_CHECK_CXXFLAGS([ -Wextra ])
-AC_CHECK_CXXFLAGS([ -Wunused ])
-AC_CHECK_CXXFLAGS([ -pedantic ])
-AC_CHECK_CXXFLAGS([ -Wno-error=format-security ])     # imfc.cpp and later versions of GCC, see https://github.com/joncampbell123/dosbox-x/issues/4436
-#AC_CHECK_CXXFLAGS([ -Wconversion ])      DO NOT ENABLE. THIS WARNING IS WAY TOO PEDANTIC TO BE USEFUL, EXCEPT FOR SPECIFIC CASES
-#AC_CHECK_CXXFLAGS([ -Wsign-conversion ])
-AC_CHECK_CXXFLAGS([ -Wlogical-op ])
-AC_CHECK_CXXFLAGS([ -Wsign-promo ])
-AC_CHECK_CXXFLAGS([ -Wconversion-null ])
-#AC_CHECK_CXXFLAGS([ -Woverloaded-virtual ])    NOT TOO USEFUL
-AC_CHECK_CXXFLAGS([ -Wno-deprecated-declarations ])
-
-dnl Let GCC 7.3.x know that the "fall through" switch cases in this codebase
-dnl are often intentional.
-AC_CHECK_CXXFLAGS([ -Wno-implicit-fallthrough ])
-
-dnl Stop reporting "type punning" warnings, I'm sick of hearing about it.
-AC_CHECK_CXXFLAGS([ -Wno-strict-aliasing ])
-
-dnl other
-AC_CHECK_CXXFLAGS([ -Wno-missing-field-initializers ])
-AC_CHECK_CXXFLAGS([ -Wno-format-zero-length ])
-
-dnl Clang/LLVM warning: don't care the address of a member may be unaligned, unless targeting ARM!
-AC_CHECK_CXXFLAGS([ -Wno-address-of-packed-member ])
-dnl Clang/LLVM warning: don't care about int to void*, since void* is either same size or larger
-AC_CHECK_CXXFLAGS([ -Wno-int-to-void-pointer-cast ])
-
-dnl Some stuff for the icon and other makefile platform stuff.
-dnl Slightly double with the above, but that deals more with compiled features.
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       dnl Some stuff for the ico
-       AC_CHECK_TOOL(WINDRES, windres, :)
-       LDFLAGS="-static -static-libgcc -static-libstdc++ $LDFLAGS"
-       DBPLATFORM="win"
-    ;;
-    *-*-darwin*)
-       WINDRES=":"
-       DBPLATFORM="mac"
-    ;;
-    *)
-       WINDRES=":"
-       DBPLATFORM="other"
-    ;;
-esac
-       AM_CONDITIONAL(HAVE_WINDRES, test "x$WINDRES" != "x:")
-       AM_CONDITIONAL(MACOSX, test "x$DBPLATFORM" = "xmac")
-       AC_SUBST(WINDRES)
-
-dnl LIBRARY TEST: SDL 2.x
-SDL2_VERSION=2.0.5
-AM_PATH_SDL2($SDL2_VERSION)
-
-dnl LIBRARY TEST: SDL 1.x
-SDL_VERSION=1.2.0
-AM_PATH_SDL($SDL_VERSION)
-
-dnl LIBRARY USE: SDL selection
-if test -n "$SDL2_LIBS"; then
-    LIBS="$LIBS $SDL2_LIBS"
-    CPPFLAGS="$CPPFLAGS $SDL2_CFLAGS"
-else
-  if test -n "$SDL_LIBS"; then
-    LIBS="$LIBS $SDL_LIBS"
-    CPPFLAGS="$CPPFLAGS $SDL_CFLAGS"
-  else
-    AC_MSG_ERROR([SDL 1.x or SDL 2.x is required to compile this program])
-  fi
-fi
-
-AH_TEMPLATE(C_GAMELINK,[Define to 1 to enable game link headless mode])
-AC_CHECK_LIB(rt, main, have_rt_lib=yes, have_rt_lib=no , )
-AC_ARG_ENABLE(gamelink,AC_HELP_STRING([--disable-gamelink],[Disable headless game link output mode (only for SDL2)]),,enable_gamelink=yes)
-AC_MSG_CHECKING(whether gamelink is enabled) 
-if test x$enable_gamelink = xyes; then
-  if test "x$SDL2_LIBS" = "x"; then
-    AC_MSG_RESULT(no (SDL2 missing))
-  else
-    AC_MSG_RESULT(yes)
-    C_GAMELINK=1
-    AC_DEFINE(C_GAMELINK,1)
-  fi
-else
-  AC_MSG_RESULT(no)
-fi
-AM_CONDITIONAL([C_GAMELINK], [test "x$C_GAMELINK" = x1])
-
-
-dnl FEATURE: Whether to use OpenGL
-AH_TEMPLATE(C_OPENGL,[Define to 1 to use opengl display output support])
-AC_ARG_ENABLE(opengl,AC_HELP_STRING([--disable-opengl],[Disable opengl support]),enable_opengl=$enableval,enable_opengl=yes)
-AC_MSG_CHECKING(whether opengl display output will be enabled)
-
-# We need to do this before any other AC_CHECK_LIB runs just to make sure
-# linking doesn't fail if SDL is using OpenGL
-if test x$enable_opengl = xyes; then
-case "$host" in
-    *-*-darwin*)
-       AC_MSG_RESULT(yes)
-       LIBS="$LIBS -framework OpenGL"
-       AC_DEFINE(C_OPENGL,1)
-       ;;
-    *)
-       pkg-config --exists gl; RES=$?
-       if test x$RES = x0; then
-         AC_MSG_RESULT(yes)
-         CFLAGS="$CFLAGS "`pkg-config gl --cflags`
-         CPPFLAGS="$CPPFLAGS "`pkg-config gl --cflags`
-         LIBS="$LIBS "`pkg-config gl --libs`
-         AC_DEFINE(C_OPENGL,1)
-       elif test x$have_gl_h = xyes -a x$have_gl_lib = xyes ; then
-         AC_MSG_RESULT(yes)
-         LIBS="$LIBS -lGL"
-         AC_DEFINE(C_OPENGL,1)
-       elif test x$have_gl_h = xyes -a x$have_opengl32_lib = xyes ; then
-         AC_MSG_RESULT(yes)
-         LIBS="$LIBS -lopengl32"
-         AC_DEFINE(C_OPENGL,1)
-       else
-         AC_MSG_RESULT(no)
-       fi
-       ;;
-esac
-fi
-
-# FIXME: Arrggh we need the WHOLE PATH
-pwd=`realpath $srcdir`
-if [[ -z "$pwd" ]]; then pwd=`pwd`; fi
-
-CFLAGS="$CFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
-LDFLAGS="$LDFLAGS -L$pwd/vs/sdlnet/linux-host/lib"
-CPPFLAGS="$CPPFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
-CXXFLAGS="$CXXFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
-
-if test x$enable_emscripten != xyes; then
-dnl Some target detection and actions for them
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       LIBS="$LIBS -lwinmm -ldsound -limm32 -lole32 -loleaut32 -lversion -lsetupapi"
-       CXXFLAGS="$CXXFLAGS -mno-ms-bitfields"
-       dnl FEATURE: Whether to support direct parallel port pass-through
-       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       ;;
-    *-*-darwin*)
-       dnl We have a problem here: both Mac OS X and Darwin report 
-       dnl the same signature "powerpc-apple-darwin*" - so we have
-       dnl to do more to distinguish them.
-       dnl For now I am lazy and do not add proper detection code.
-       macosx=1
-       if test x$warn_cpp11 = x1; then
-           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++14";
-       else
-           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++11";
-       fi
-       AC_DEFINE(MACOSX, 1, [Compiling on Mac OS X])
-       LIBS="$LIBS -framework Carbon -framework CoreFoundation -framework CoreMIDI -framework AudioUnit -framework AudioToolbox -framework ApplicationServices -framework AppKit -framework IOKit"
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       ;;
-    *-*-linux*)
-       AC_DEFINE(LINUX, 1, [Compiling on GNU/Linux])
-       CXXFLAGS="$CXXFLAGS -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L"
-       LIBS="$LIBS -lrt" # uses shm_* functions which requires librt on Linux
-       dnl FEATURE: Whether to support direct parallel port pass-through
-       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       ;;
-    *-*-haiku*)
-       AC_DEFINE(HAIKU, 1, [Compiling on Haiku])
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       LIBS="$LIBS -lnetwork -lbsd -lbe"
-       ;;
-    *-*-freebsd* | *-*-dragonfly* | *-*-netbsd* | *-*-openbsd*)
-       dnl FEATURE: Whether to support direct parallel port pass-through
-       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
-       dnl Disabled directserial for now. It doesn't do anything without
-       dnl specifying an extra ifdef in directserial_posix.*
-       dnl directserial detection should be rewritten to test for the needed
-       dnl functions and headers. I currently do not know 
-       dnl which ones are needed for BSD
-       AC_DEFINE(BSD, 1, [Compiling on BSD])
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       ;;
-    *-*-os2-emx*)
-       AC_DEFINE(OS2, 1, [Compiling on OS/2 EMX])
-       dnl FEATURE: Whether to support direct serial port pass-through
-       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
-       ;;
-    *-*-riscos*)
-       AC_DEFINE(RISCOS, 1, [Compiling on RISC OS])
-       dnl The following line is required in order to use std::to_string()
-       CXXFLAGS="$CXXFLAGS -D_GLIBCXX_USE_C99=1"
-       ;;
-esac
-
-dnl Fix for FreeBSD not automatically linking to pthread for std::thread
-case "$host" in
-    *-*-freebsd*)
-       LIBS="$LIBS -lpthread"
-    ;;
-esac
-
-dnl OpenBSD/i386 and NetBSD/i386 require linking to libi386.a for i386_iopl() (for initPassthroughIO()).
-dnl OpenBSD/x86_64 requires linking to libamd64.a for amd64_iopl(). NetBSD/x86_64 requires linking to libx86_64.a for x86_64_iopl().
-case "$host" in
-    i*86-*-openbsd* | i*86-*-netbsd*)
-       LIBS="$LIBS -li386"
-       ;;
-    x86_64-*-openbsd*)
-       LIBS="$LIBS -lamd64"
-       ;;
-    x86_64-*-netbsd*)
-       LIBS="$LIBS -lx86_64"
-       ;;
-esac
-fi
-
-AM_CONDITIONAL(MACOSX, test x"$macosx" = x"1")
-AM_CONDITIONAL(EMSCRIPTEN, test x"$enable_emscripten" = x"yes")
-
-dnl The target cpu checks for dynamic cores
-AH_TEMPLATE(C_TARGETCPU,[The type of cpu this target has])
-AC_MSG_CHECKING(for target cpu type) 
-case "$host_cpu" in
-  x86_64 | amd64)
-    AC_DEFINE(C_TARGETCPU,X86_64)
-    AC_MSG_RESULT(x86-64 bit compatible)
-    c_targetcpu="x86_64"
-    c_unalignedmemory=yes
-    ;;
-  i?86)
-    AC_DEFINE(C_TARGETCPU,X86)
-    AC_MSG_RESULT(x86 compatible)
-    c_targetcpu="x86"
-    c_unalignedmemory=yes
-    ;;
-   powerpc*)
-    AC_DEFINE(C_TARGETCPU,POWERPC)
-    AC_MSG_RESULT(Power PC)
-    c_targetcpu="powerpc"
-    c_unalignedmemory=yes
-    ;;
-   m68k*)
-    AC_DEFINE(C_TARGETCPU,M68K)
-    AC_MSG_RESULT(Motorola 68000)
-    c_targetcpu="m68k"
-    c_unalignedmemory=yes
-    ;;
-   armv7*)
-    AC_DEFINE(C_TARGETCPU,ARMV7LE)
-    AC_MSG_RESULT(ARMv7 Little Endian)
-    c_targetcpu="arm"
-    c_unalignedmemory=yes
-    ;;
-   armv6*)
-    AC_DEFINE(C_TARGETCPU,ARMV4LE)
-    AC_MSG_RESULT(ARMv6 Little Endian)
-    c_targetcpu="arm"
-    dnl c_unalignedmemory=yes
-    ;;
-   aarch64)
-    AC_DEFINE(C_TARGETCPU,ARMV8LE)
-    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
-    c_targetcpu="arm"
-    c_unalignedmemory=yes
-    ;;
-   arm) # Mac OS X uname -m says "arm64", for some reason it becomes "arm" ?
-    AC_DEFINE(C_TARGETCPU,ARMV8LE)
-    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
-    c_targetcpu="arm"
-    c_unalignedmemory=yes
-    ;;
-   *)
-    AC_DEFINE(C_TARGETCPU,UNKNOWN)
-    AC_MSG_RESULT(unknown)
-    c_unalignedmemory=no
-    ;;
-esac
-
-dnl TODO: Need GCC to know this code is using C++ lamda functions
-
-dnl LIBRARY TEST: ALSA
-AM_PATH_ALSA(0.9.0, AC_DEFINE(HAVE_ALSA,1,[Define to 1 to use ALSA for MIDI]) , : )
-
-dnl Some stuff for the icon.
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       dnl MinGW puts ncurses headers in a subdir
-       ncursescfg=`ncursesw6-config --cflags`
-       CXXFLAGS="$CXXFLAGS $ncursescfg"
-       CPPFLAGS="$CPPFLAGS $ncursescfg"
-       CFLAGS="$CFLAGS $ncursescfg"
-    ;;
-    *)
-       WINDRES=":"
-    ;;
-esac
-
-
-dnl LIBRARY TEST: curses
-AC_CHECK_HEADER(curses.h,have_curses_h=yes,)
-AC_CHECK_LIB(curses, initscr, curses_lib=curses, , )
-AC_CHECK_LIB(ncurses, initscr, curses_lib=ncurses, , )
-AC_CHECK_LIB(pdcurses, initscr, curses_lib=pdcurses, , )
-# Check if this system's ncurses uses a separate tinfo library
-AC_CHECK_LIB(tinfo, nodelay,
-	     if test x$curses_lib = xncurses ; then
-	       LIBS="$LIBS -ltinfo";
-	     fi)
-
-dnl LIBRARY TEST: libzlib
-AC_CHECK_HEADER(zlib.h,have_zlib_h=yes,)
-AC_CHECK_LIB(z, inflateEnd, have_zlib_lib=yes, ,)
-
-dnl LIBRARY TEST: libpng
-AC_CHECK_HEADER(png.h,have_png_h=yes,)
-AC_CHECK_LIB(png, png_get_io_ptr, have_png_lib=yes, ,-lz)
-
-dnl LIBRARY TEST: libpcap
-AC_CHECK_HEADER(pcap.h,have_pcap_h=yes,)
-AC_CHECK_LIB(pcap, pcap_open_live, have_pcap_lib=yes, ,-lz)
-
-dnl LIBRARY TEST: libslirp
-AC_CHECK_HEADER(slirp/libslirp.h,have_slirp_h=yes,)
-AC_CHECK_LIB(slirp, slirp_input, have_slirp_lib=yes, ,-lz)
-
-dnl LIBRARY TEST: libiconv
-AC_CHECK_HEADER(iconv.h,have_iconv_h=yes,)
-dnl TEST: check if iconv uses const char
-AC_MSG_CHECKING([whether iconv uses const char**])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([
-#include <iconv.h>
-size_t iconv(iconv_t, const char **restrict, size_t *restrict, char **restrict, size_t *restrict);
-])], AC_DEFINE(ICONV_CONST_CHAR, 1) AC_MSG_RESULT(yes), AC_MSG_RESULT(no))
-AH_TEMPLATE(ICONV_CONST_CHAR,[Whether iconv uses const char**])
-
-dnl LIBRARY TEST: SDLnet
-AC_CHECK_HEADER(SDL_net.h,have_sdl_net_h=yes,)
-AC_CHECK_LIB(SDL2_net, SDLNet_Init, have_sdl2_net_lib=yes, , )
-AC_CHECK_LIB(SDL_net, SDLNet_Init, have_sdl_net_lib=yes, , )
-
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([
-#include <SDL_config.h>
-#ifndef SDL_VIDEO_DRIVER_X11
-#error SDL_VIDEO_DRIVER_X11
-#endif
-void test(){}
-])], , enable_x11=no)
-if test x$enable_x11 != xno; then
-  dnl LIBRARY TEST: X11 Xlib support
-  AC_CHECK_LIB(X11, main, have_x11_lib=yes, have_x11_lib=no, )
-  AC_CHECK_LIB(Xrandr, XRRGetCrtcInfo, have_xrandr_lib=yes, have_xrandr_lib=no, )
-  AC_CHECK_HEADER(X11/XKBlib.h, have_x11_h=yes, have_x11_h=no, )
-
-  dnl Compile test will fail for XKBrules.h if we do not also include XKBlib.h
-  dnl Hope your compiler supports the GCC style -include option!
-  if test x$have_x11_h = xyes; then
-    save_CPPFLAGS=$CPPFLAGS
-    CPPFLAGS="$CPPFLAGS -include X11/XKBlib.h"
-
-    AC_CHECK_HEADER(X11/extensions/XKBrules.h, have_x11_ext_xkbrules_h=yes, have_x11_ext_xkbrules_h=no, )
-    AC_CHECK_HEADER(X11/extensions/XKBfile.h, have_xkbfile_h=yes, have_xkbfile_h=no, )
-
-    CPPFLAGS=$save_CPPFLAGS
-  fi
-fi
-
-dnl LIBRARY TEST: Fluidsynth support
-AC_CHECK_HEADER(fluidsynth.h,have_fluidsynth_h=yes,)
-AC_CHECK_LIB(fluidsynth, fluid_synth_sysex, have_fluidsynth_lib=yes,,)
-
-dnl LIBRARY TEST: FreeType2
-AH_TEMPLATE(C_FREETYPE,[Define to 1 to enable freetype support])
-AC_ARG_ENABLE(freetype,AC_HELP_STRING([--disable-freetype],[Disable freetype support]),enable_freetype=$enableval,enable_freetype=yes)
-AM_CONDITIONAL(C_FREETYPE, test "x$enable_freetype" = "xyes")
-if test x$enable_freetype = xyes; then
-  AC_MSG_CHECKING(for freetype)
-  if test x$INTERNAL_FREETYPE = x1; then
-    # CFLAGS and LDFLAGS were already updated by build-macos
-    AC_DEFINE(C_FREETYPE,1)
-    AC_MSG_RESULT(yes)
-  else
-    pkg-config --exists freetype2; RES=$?
-    if test x$RES = x0; then
-      CFLAGS="$CFLAGS "`pkg-config freetype2 --cflags`
-      CPPFLAGS="$CPPFLAGS "`pkg-config freetype2 --cflags`
-      LIBS="$LIBS "`pkg-config freetype2 --libs`
-      AC_DEFINE(C_FREETYPE,1)
-      AC_MSG_RESULT(yes)
-    else
-      enable_freetype=no
-      AC_MSG_RESULT(no)
-    fi
-  fi
-fi
-
-dnl LIBRARY TEST: FFMPEG support
-pkg-config --exists libavcodec; RES=$?
-if test x$RES = x0; then
-  have_avcodec_h=yes
-  have_ffmpeg=yes
-else
-  have_avcodec_h=no
-  have_ffmpeg=no
-fi
-
-dnl LIBRARY TEST: OpenGL support
-AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
-AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
-AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )
-
-dnl LIBRARY TEST: Direct3D 9 header support
-AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
-AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )
-
-dnl ================== SDL net special test for OS/2
-if test x$host = xi386-pc-os2-emx ; then
-  LIBS_BACKUP=$LIBS;
-  LIBS="$LIBS -lSDL_Net";
-  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <SDL_Net.h>]],[[
-	SDLNet_Init ();
-  ]])], [AC_MSG_RESULT(yes); have_sdl_net_lib=yes], AC_MSG_RESULT(no))
-  LIBS=$LIBS_BACKUP
-fi
-
-dnl FEATURE: PRINTER (requires FreeType2)
-AH_TEMPLATE(C_PRINTER,[Define to 1 to enable printer emulation])
-AC_ARG_ENABLE(printer,AC_HELP_STRING([--disable-printer],[disable printer emulation]),enable_printer=$enableval,enable_printer=yes)
-AM_CONDITIONAL(C_PRINTER, test "x$enable_printer" = "xyes")
-if test x$enable_freetype = xyes; then
-  if test x$enable_printer = xyes; then
-    AC_DEFINE(C_PRINTER,1)
-  fi
-fi
-
-dnl FEATURE: xBRZ
-AH_TEMPLATE(C_XBRZ,[Define to 1 to enable XBRZ scaler])
-AC_ARG_ENABLE(xbrz,AC_HELP_STRING([--enable-xbrz],[compile with xBRZ scaler (default yes)]),enable_xbrz=$enableval,enable_xbrz=yes)
-AM_CONDITIONAL(C_XBRZ, test "x$enable_xbrz" = "xyes")
-if test x$enable_emscripten != xyes; then
-  if test x$enable_xbrz = xyes; then
-    AC_DEFINE(C_XBRZ,1)
-  fi
-fi
-
-dnl FEATURE: xBRZ
-AH_TEMPLATE(C_SCALER_FULL_LINE,[Define to 1 to alter the simpler render scalers to operate only on the full scanline instead of detecting differences. This is a performance adjustment for slow or embedded systems])
-AC_ARG_ENABLE(scaler-full-line,AC_HELP_STRING([--enable-scaler-full-line],[scaler render full line instead of detecting changes, for slower systems]),enable_scaler_full_line=$enableval,enable_scaler_full_line=no)
-AM_CONDITIONAL(C_SCALER_FULL_LINE, test "x$enable_scaler_full_line" = "xyes")
-if test x$enable_scaler_full_line = xyes; then
-  AC_DEFINE(C_SCALER_FULL_LINE,1)
-fi
-
-dnl FEATURE: MIDI through ALSA
-AC_ARG_ENABLE(alsa-midi,
-AC_HELP_STRING([--enable-alsa-midi],[compile with alsa midi support (default yes)]),
-[ case "${enableval}" in
- yes) alsa_midi=true;;
- no)  alsa_midi=false;;
-esac],
-[alsa_midi=true])
-if test x$alsa_midi = xtrue ; then 
-  CXXFLAGS="$CXXFLAGS $ALSA_CFLAGS"
-fi
-
-dnl FEATURE: MT32 (MUNT) emulation
-AH_TEMPLATE(C_MT32,[Define to 1 to enable MT32 emulation])
-AC_ARG_ENABLE(mt32,AC_HELP_STRING([--disable-mt32],[Disable MT32 emulation]),,enable_mt32=yes)
-AC_MSG_CHECKING(whether MT32 emulation will be enabled) 
-
-# test
-if test x$enable_mt32 = xyes ; then 
-  case "$host_cpu" in
-    x86_64 | amd64)
-      AC_MSG_RESULT(yes)
-      AC_DEFINE(C_MT32,1)
-      ;;
-    i?86)
-      AC_MSG_RESULT(yes)
-      AC_DEFINE(C_MT32,1)
-      ;;
-    arm)
-      AC_MSG_RESULT(yes)
-      AC_DEFINE(C_MT32,1)
-      ;;
-    aarch64)
-      AC_MSG_RESULT(yes)
-      AC_DEFINE(C_MT32,1)
-      ;;
-    *)
-      enable_mt32=no
-      AC_MSG_RESULT(no)
-      ;;
-  esac
-else
-  enable_mt32=no
-  AC_MSG_RESULT(no)
-fi 
-AM_CONDITIONAL(C_MT32, test "x$enable_mt32" = "xyes")
-
-dnl On some Linux platforms, std::atomic needs a helper library
-case "$host" in
-  *-*-linux*)
-    case "$host_cpu" in
-      x86_64 | amd64)
-        ;;
-      i?86)
-        ;;
-      *)
-        AC_MSG_CHECKING(whether -latomic is needed)
-        AC_LINK_IFELSE([AC_LANG_SOURCE([
-          #include <atomic>
-          #include <cstdint>
-          std::atomic<std::int64_t> v;
-            int main() {
-              return v;
-            }
-        ])],STD_ATOMIC_NEED_LIBATOMIC=no,STD_ATOMIC_NEED_LIBATOMIC=yes)
-        AC_MSG_RESULT($STD_ATOMIC_NEED_LIBATOMIC)
-        if test "x$STD_ATOMIC_NEED_LIBATOMIC" = xyes; then
-          LIBS="$LIBS -latomic"
-        fi
-        ;;
-    esac
-    ;;
-esac
-
-dnl NASM (Netwide Assembler)
-AC_PATH_PROG([NASM], [nasm])
-if test -z "$ac_cv_path_NASM"; then
-    AC_MSG_WARN([NASM (netwide assembler) not found, you will not be able to compile the external x86 .asm files if they are modified])
-fi
-
-dnl FEATURE: DEBUG and HEAVY DEBUG options (debugger)
-AH_TEMPLATE(C_DEBUG,[Define to 1 to enable internal debugger, requires libcurses])
-AH_TEMPLATE(C_HEAVY_DEBUG,[Define to 1 to enable heavy debugging, also have to enable C_DEBUG])
-AC_ARG_ENABLE(debug,AC_HELP_STRING([--enable-debug],[Enable debug mode]),[
-   if test x$enable_debug = xno; then
-     AC_MSG_RESULT([Debugger not enabled])
-   elif test x$curses_lib != x -a x$have_curses_h = xyes; then
-     LIBS="$LIBS -l$curses_lib"
-     AC_DEFINE(C_DEBUG,1)
-     if test x$enable_debug = xheavy ; then 
-       AC_DEFINE(C_HEAVY_DEBUG,1)
-     fi
-   else 
-     AC_MSG_ERROR([Can't find curses, which is required for debug mode])
-   fi
-],)
-
-dnl automake 1.14 and upwards rewrite the host to have always 64 bit unless i386 as host is passed
-dnl this can make building a 32 bit executable a bit tricky, as dosbox relies on the host to select the
-dnl dynamic/dynrec core
-AC_MSG_CHECKING([whether Apple user wants to override the build process to produce a 32 bit binary])
-case "$host" in 
-  *-*-darwin*)
-   if test x$c_targetcpu = xx86_64 -a x$c_sizep = x4 ; then
-     AC_MSG_RESULT(yes)
-     AC_DEFINE(C_TARGETCPU,X86)
-     c_targetcpu="x86"
-   else
-     AC_MSG_RESULT(no)
-   fi
-   ;;
-  *)
-   AC_MSG_RESULT([no, not on Apple])
-   ;;
-esac
-
-dnl FEATURE: Whether to enable dynamic core
-AC_ARG_ENABLE(dynamic-core,AC_HELP_STRING([--disable-dynamic-core],[Disable all dynamic cores]),,enable_dynamic_core=yes)
-
-dnl FEATURE: Whether to enable x86 dynamic core
-AH_TEMPLATE(C_DYNAMIC_X86,[Define to 1 to use x86/x64 dynamic cpu core])
-AC_ARG_ENABLE(dynamic-x86,AC_HELP_STRING([--disable-dynamic-x86],[Disable x86/x64 dynamic cpu core]),,enable_dynamic_x86=yes)
-AC_MSG_CHECKING(whether x86 dynamic cpu core will be enabled)
-if test x$enable_dynamic_x86 = xno -o x$enable_dynamic_core = xno; then
-   AC_MSG_RESULT(no)
-elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
-   AC_DEFINE(C_DYNAMIC_X86,1)
-   AC_MSG_RESULT(yes)
-else
-   AC_MSG_RESULT(no)
-fi
-
-dnl FEATURE: Whether to enable recompiling dynamic core
-AH_TEMPLATE(C_DYNREC,[Define to 1 to use recompiling cpu core])
-AC_ARG_ENABLE(dynrec,AC_HELP_STRING([--disable-dynrec],[Disable recompiling cpu core]),,enable_dynrec=yes)
-AC_MSG_CHECKING(whether recompiling cpu core will be enabled) 
-if test x$enable_dynrec = xno -o x$enable_dynamic_core = xno; then 
-   AC_MSG_RESULT(no)
-# test for MIPS32 is missing from this Dynamic Recompiler whitelist
-elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64 -o x$c_targetcpu = xarm; then
-   AC_DEFINE(C_DYNREC,1)
-   AC_MSG_RESULT(yes)
-
-   case "$host" in
-      *-*-openbsd*)
-         AC_MSG_WARN([DOSBox-X will be linked with "wxneeded" to support dynrec core on OpenBSD])
-         LDFLAGS="-Wl,-z,wxneeded $LDFLAGS"
-      ;;
-   esac
-else
-   AC_MSG_RESULT(no)
-fi
-
-dnl FEATURE: Whether to emulate the floating point unit
-AH_TEMPLATE(C_FPU,[Define to 1 to enable floating point emulation])
-AC_ARG_ENABLE(fpu,AC_HELP_STRING([--disable-fpu],[Disable fpu support]),,enable_fpu=yes)
-AC_MSG_CHECKING(whether fpu emulation will be enabled) 
-if test x$enable_fpu = xyes ; then 
-  AC_MSG_RESULT(yes)
-  AC_DEFINE(C_FPU,1)
-else 
-  AC_MSG_RESULT(no)
-fi 
-
-AH_TEMPLATE(C_FPU_X86,[Define to 1 to use a x86/x64 assembly fpu core])
-AC_ARG_ENABLE(fpu-x86,AC_HELP_STRING([--disable-fpu-x86],[Disable x86 assembly fpu core]),,enable_fpu_x86=yes)
-AC_ARG_ENABLE(fpu-x64,AC_HELP_STRING([--disable-fpu-x64],[Disable x64 assembly fpu core]),,enable_fpu_x64=yes)
-AC_MSG_CHECKING(whether the x86/x64 assembly fpu core will be enabled) 
-if test x$enable_fpu_x86 = xno -o x$enable_fpu_x64 = xno; then 
-   AC_MSG_RESULT(no)
-else
-  if test x$enable_fpu = xyes; then
-    if test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
-        AC_DEFINE(C_FPU_X86,1)
-        AC_MSG_RESULT(yes)
-    else
-        AC_MSG_RESULT(no)
-    fi
-  else
-      AC_MSG_RESULT(no)
-  fi
-fi
-
-dnl FEATURE: Whether to enable unaligned memory access
-AH_TEMPLATE(C_UNALIGNED_MEMORY,[Define to 1 to use a unaligned memory access])
-AC_ARG_ENABLE(unaligned_memory,AC_HELP_STRING([--disable-unaligned-memory],[Disable unaligned memory access]),,enable_unaligned_memory=yes)
-AC_MSG_CHECKING(whether to enable unaligned memory access) 
-if test x$enable_unaligned_memory = xyes -a x$c_unalignedmemory = xyes; then 
-  AC_DEFINE(C_UNALIGNED_MEMORY,1)
-  AC_MSG_RESULT(yes)
-else
-  AC_MSG_RESULT(no)
-fi
-
-dnl FEATURE: Whether to support SDL net, and emulate modem and IPX connections
-AH_TEMPLATE(C_SDL_NET,[Indicate whether SDL_net is present])
-AH_TEMPLATE(C_MODEM,[Define to 1 to enable internal modem support, requires SDL_net])
-AH_TEMPLATE(C_IPX,[Define to 1 to enable IPX over Internet networking, requires SDL_net])
-
-case "$host" in
-  *-*-cygwin* | *-*-mingw32*)
-    if test x$have_sdl_net_h = xyes; then
-      have_sdl_net_lib=yes
-    fi
-  ;;
-esac
-dnl enable SDL2 net if SDL2
-if test -n "$SDL2_LIBS"; then
- if test x$disable_sdl_net = xyes ; then
-  AC_MSG_WARN([SDL_net is disabled in parameters])
- elif test x$have_sdl2_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
-  LIBS="$LIBS -lSDL2_net"
-  AC_DEFINE(C_SDL_NET,1)
-  AC_DEFINE(C_MODEM,1)
-  AC_DEFINE(C_IPX,1)
-  have_sdl_net=yes
- elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
-  LIBS="$LIBS -lSDL_net"
-  AC_DEFINE(C_SDL_NET,1)
-  AC_DEFINE(C_MODEM,1)
-  AC_DEFINE(C_IPX,1)
-  have_sdl_net=yes
- else
-  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
- fi
-else
- if test x$disable_sdl_net = xyes ; then
-  AC_MSG_WARN([SDL_net is disabled in parameters])
- elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
-  LIBS="$LIBS -lSDL_net"
-  AC_DEFINE(C_SDL_NET,1)
-  AC_DEFINE(C_MODEM,1)
-  AC_DEFINE(C_IPX,1)
-  have_sdl_net=yes
- else 
-  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
- fi
-fi
-
-dnl FEATURE: Whether to support libz, and enable snapshots
-AH_TEMPLATE(C_LIBZ,[Define to 1 if you have libz])
-if test x$have_zlib_lib = xyes -a x$have_zlib_h = xyes ; then
-  LIBS="$LIBS -lz"
-  AC_DEFINE(C_LIBZ,1)
-fi
-
-dnl FEATURE: Whether to support libpng, and enable snapshots
-AH_TEMPLATE(C_LIBPNG,[Define to 1 if you have libpng])
-AH_TEMPLATE(C_SSHOT,[Define to 1 to enable screenshots, requires libpng])
-AC_ARG_ENABLE(screenshots,AC_HELP_STRING([--disable-screenshots],[Disable screenshots and movie recording]),,enable_screenshots=yes)
-AC_MSG_CHECKING([whether screenshots will be enabled])
-if test x$enable_screenshots = xyes; then 
-    if test x$have_png_lib = xyes -a x$have_png_h = xyes ; then
-    LIBS="$LIBS -lpng -lz"
-    AC_DEFINE(C_LIBPNG,1)
-    AC_DEFINE(C_SSHOT,1)
-    AC_MSG_RESULT([yes])
-  else
-    AC_MSG_RESULT([no, can't find libpng.])
-  fi
-else
-  AC_MSG_RESULT([no])
-fi
-
-dnl FEATURE: Whether to use libpcap, and enable ethernet pass-through
-AH_TEMPLATE(C_PCAP,[Define to 1 to enable ethernet pass-through, requires libpcap])
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       CFLAGS="$CFLAGS -I$pwd/vs/pcap"
-       CXXFLAGS="$CXXFLAGS -I$pwd/vs/pcap"
-       AC_DEFINE(C_PCAP,1)
-    ;;
-    *)
-       if test x$have_pcap_lib = xyes -a x$have_pcap_h = xyes ; then
-         LIBS="$LIBS -lpcap";
-         AC_DEFINE(C_PCAP,1)
-       else
-         AC_MSG_WARN([Can't find libpcap, ethernet pass-through disabled])
-       fi
-    ;;
-esac
-
-dnl FEATURE: Whether to use libslirp, and enable userspace TCP/IP emulation
-AH_TEMPLATE(C_SLIRP, [Define to 1 to enable userspace TCP/IP emulation, requires libslirp])
-AC_ARG_ENABLE(libslirp,AC_HELP_STRING([--disable-libslirp],[Disable libslirp support]),enable_libslirp=$enableval,enable_libslirp=yes)
-if test x$enable_libslirp = xyes ; then
-  case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       if test x$have_slirp_h = xyes; then
-         have_slirp_lib=yes
-       fi
-    ;;
-  esac
-  if test x$have_slirp_lib = xyes -a x$have_slirp_h = xyes ; then
-    have_slirp=yes
-    AC_DEFINE(C_SLIRP,1)
-    LIBS="$LIBS "`pkg-config slirp --libs`
-    CFLAGS="$CFLAGS "`pkg-config slirp --cflags`
-    CPPFLAGS="$CPPFLAGS "`pkg-config slirp --cflags`
-    case "$host" in
-      *-*-cygwin* | *-*-mingw32*)
-         LIBS="$LIBS -lintl"
-      ;;
-    esac
-  else
-    have_slirp=no
-    AC_MSG_WARN([Can't find libslirp, userspace TCP/IP emulation disabled])
-  fi
-fi
-
-if test x$enable_x11 != xno; then
-  dnl FEATURE: Whether to use X11 XKBlib
-  AH_TEMPLATE(C_X11_XKB,[define to 1 if you have XKBlib.h and X11 lib])
-  AC_MSG_CHECKING(for XKBlib support)
-  if test x$have_x11_lib = xyes -a x$have_x11_h = xyes ; then
-    LIBS="$LIBS -lX11"
-    AC_DEFINE(C_X11_XKB,1)
-    AC_MSG_RESULT(yes)
-  else
-    AC_MSG_RESULT(no)
-  fi
-
-  dnl FEATURE: Whether to use X11 XRandR
-  AH_TEMPLATE(C_X11_XRANDR,[define to 1 if you have XRandr.h and X11 lib])
-  AC_MSG_CHECKING(for XRandR support)
-  if test x$have_xrandr_lib = xyes -a x$have_x11_h = xyes ; then
-    LIBS="$LIBS -lXrandr"
-    AC_DEFINE(C_X11_XRANDR,1)
-    AC_MSG_RESULT(yes)
-  else
-    AC_MSG_RESULT(no)
-  fi
-
-  dnl Having XKBlib doesn't mean XKBrules.h is around
-  if test x$have_x11_ext_xkbrules_h = xyes ; then
-    AH_TEMPLATE(C_X11_EXT_XKBRULES,[define to 1 if XKBrules.h is present])
-    AC_DEFINE(C_X11_EXT_XKBRULES,1)
-  fi
-  if test x$have_xkbfile_h = xyes ; then
-    AH_TEMPLATE(C_X11_XKBFILE,[define to 1 if XKBfile.h is present])
-    AC_DEFINE(C_X11_XKBFILE,1)
-    LIBS="$LIBS -lxkbfile"
-  fi
-
-  if test x$have_x11_h = xyes ; then
-    AH_TEMPLATE(C_X11,[define to 1 to enable X11 support])
-    AC_DEFINE(C_X11,1)
-  fi
-fi
-
-dnl FEATURE: Whether to use Fluidsynth
-AH_TEMPLATE(C_FLUIDSYNTH,[Define to 1 to enable libfluidsynth MIDI synthesis])
-AC_ARG_ENABLE(libfluidsynth,AC_HELP_STRING([--disable-libfluidsynth],[Disable libfluidsynth support]),enable_libfluidsynth=$enableval,enable_libfluidsynth=yes)
-if test x$enable_libfluidsynth = xyes; then
-    case "$host" in
-        *-*-linux*)
-        if test x$have_fluidsynth_h = xyes; then
-          have_fluidsynth_lib=yes
-        fi
-      ;;
-    esac
-    if test x$have_fluidsynth_lib = xyes -a x$have_fluidsynth_h = xyes ; then
-      LIBS="$LIBS -lfluidsynth"
-      AC_DEFINE(C_FLUIDSYNTH,1)
-    else
-      AC_MSG_WARN([libfluidsynth MIDI synthesis not available])
-    fi
-fi
-
-dnl FEATURE: FFMPEG output support
-AH_TEMPLATE(C_AVCODEC,[Define to 1 to use FFMPEG libavcodec for video capture])
-AC_ARG_ENABLE(avcodec,AC_HELP_STRING([--enable-avcodec],[Enable FFMPEG avcodec support]),enable_ffmpeg=$enableval,enable_ffmpeg=yes)
-if test x$enable_ffmpeg = xyes; then
-    if test x$have_ffmpeg = xyes; then
-        if test x$have_avcodec_h = xyes; then
-            PKGS="libavcodec libavformat libavutil libswscale libswresample"
-            CFLAGS="$CFLAGS "`pkg-config $PKGS --cflags`
-            CPPFLAGS="$CPPFLAGS "`pkg-config $PKGS --cflags`
-            LIBS=`pkg-config $PKGS --libs`" $LIBS"
-            AC_MSG_RESULT(yes)
-            AC_DEFINE(C_AVCODEC,1)
-        fi
-    fi
-fi
-
-dnl FEATURE: Whether to use Direct3D 9 output
-AH_TEMPLATE(HAVE_D3D9_H,[Define to 1 to use Direct3D 9 display output support])
-AC_ARG_ENABLE(d3d9,AC_HELP_STRING([--enable-d3d9],[Enable Direct3D 9 support]),enable_d3d9=$enableval,enable_d3d9=no)
-AC_MSG_CHECKING(whether Direct3D 9 display output will be enabled)
-
-dnl FEATURE: Direct3D9 shaders
-AH_TEMPLATE(C_D3DSHADERS,[Define to 1 to use Direct3D shaders])
-AC_ARG_ENABLE(d3d-shaders,AC_HELP_STRING([--enable-d3d-shaders],[Enable Direct3D shaders]),enable_d3d_shaders=$enableval,enable_d3d_shaders=no)
-
-if test x$enable_d3d9 = xyes; then
-    case "$host" in
-        *-*-cygwin* | *-*-mingw32*)
-        if test x$have_d3d9_h = xyes -a x$have_d3dx9math_h = xyes ; then
-	    do_d3d=1
-            AC_MSG_RESULT(yes)
-            AH_TEMPLATE(C_DIRECT3D,[Define to 1 to enable Direct3D 9 display output support])
-            AC_DEFINE(HAVE_D3D9_H,1)
-            AC_DEFINE(C_DIRECT3D,1)
-            if test x$enable_d3d_shaders = xyes; then
-                AC_DEFINE(C_D3DSHADERS,1)
-            fi
-        else
-            AC_MSG_RESULT(no)
-        fi
-        ;;
-    *)
-        AC_MSG_RESULT(no)
-        ;;
-    esac
-else
-  AC_MSG_RESULT(no)
-fi
-
-AM_CONDITIONAL(C_DIRECT3D, test x"$do_d3d" = x"1")
-
-AH_TEMPLATE(C_ICONV,[Define to 1 to use iconv])
-if test x$have_iconv_h = xyes; then
-    AC_DEFINE(C_ICONV,1)
-    AC_MSG_CHECKING([whether we must link against -liconv])
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-    #include <iconv.h>
-    iconv_t wrap_open(const char *tocode, const char *fromcode) {
-      return iconv_open(tocode, fromcode);
-    }]])],
-    AC_MSG_RESULT(no), [AC_MSG_RESULT(yes);LIBS="$LIBS -liconv"])
-fi
-
-dnl placeholder
-AH_TEMPLATE(C_ICONV_WIN32,[Define to 1 to use Win32 functions in iconv backend])
-
-dnl If networking is used, add networking libraries last on Windows
-dnl so SDL_net, fluidsynth and libslirp successfully link to them
-if test x$enable_emscripten != xyes; then
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-       if test x$have_slirp = xyes; then
-         LIBS="$LIBS -luuid -lole32"
-       fi
-       LIBS="$LIBS -lwsock32 -lws2_32 -liphlpapi -lshlwapi"
-       if test x$enable_freetype = xyes; then
-         LIBS="$LIBS -lfreetype -lwinspool"
-       fi
-    ;;
-esac
-fi
-
-dnl LIBRARY USE: opencow
-case "$host" in
-    *-*-cygwin* | *-*-mingw32*)
-    if test x$enable_opencow = xyes; then
-      LIBS="-lopencow $LIBS -lstdc++ -lopencow" #need to put at the first, also better at the last too.
-      LDFLAGS="$LDFLAGS -Wl,--allow-multiple-definition "
-      if test -n "$SDL_LIBS"; then
-        LIBS="${LIBS//-luser32/-lopencow -luser32}"
-        #SDL_LIBS="${SDL_LIBS//-luser32/\-lopencow -luser32}"
-      fi
-    fi
-    ;;
-esac
-
-dnl BUILD: whether to enable universal binary support
-if test x"$macosx" = x"1" && test x"$host_cpu" = x"arm"; then
-  AC_ARG_ENABLE(universal,AC_HELP_STRING([--enable-universal],[Enable macOS universal binary support]),
-    [enable_universal=$enableval],
-    [enable_universal=no])
-else
-  enable_universal=no
-fi
-
-AM_CONDITIONAL(MACOS_UNIVERSAL, [ test x$enable_universal = xyes ])
-
-AC_CONFIG_FILES([ 
-Makefile
-src/Makefile
-src/cpu/Makefile
-src/cpu/core_full/Makefile
-src/cpu/core_normal/Makefile
-src/debug/Makefile
-src/dos/Makefile
-src/fpu/Makefile
-src/gamelink/Makefile
-src/gui/Makefile
-src/hardware/Makefile
-src/hardware/mame/Makefile
-src/hardware/serialport/Makefile
-src/hardware/reSID/Makefile
-src/hardware/parport/Makefile
-src/aviwriter/Makefile
-src/ints/Makefile
-src/libs/Makefile
-src/libs/zmbv/Makefile
-src/libs/gui_tk/Makefile
-src/libs/passthroughio/Makefile
-src/libs/mt32/Makefile
-src/libs/xBRZ/Makefile
-src/libs/fluidsynth/Makefile
-src/libs/decoders/internal/Makefile
-src/output/Makefile
-src/output/direct3d/Makefile
-src/builtin/Makefile
-src/misc/Makefile
-src/shell/Makefile
-src/platform/Makefile
-include/Makefile
-contrib/macos/dosbox-x.plist
-contrib/linux/dosbox-x.spec
-contrib/linux/com.dosbox_x.DOSBox-X.metainfo.xml
-make-rpm.sh
-])
-AC_OUTPUT
-
-# HACK: it's a script...
-chmod +x make-rpm.sh
+dnl Init.
+AC_INIT(dosbox-x,2023.10.06,[https://github.com/joncampbell123/dosbox-x/issues],[],[https://dosbox-x.com])
+AC_PREREQ(2.60)
+AC_CONFIG_SRCDIR(README.md)
+
+dnl Utility function ============================
+
+# AC_CHECK_CPPFLAGS(ADDITIONAL-CPPFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
+#
+# checks whether the $(C) compiler accepts the ADDITIONAL-CPPFLAGS
+# if so, they are added to the CPPFLAGS
+AC_DEFUN([AC_CHECK_CPPFLAGS],
+[
+  AC_MSG_CHECKING([whether $CPP accepts "$1"])
+  temp_check_cppflags="${CPPFLAGS}"
+  CPPFLAGS="$1 ${CPPFLAGS}"
+  AC_PREPROC_IFELSE(
+        [AC_LANG_SOURCE([[int main(void){return 0;}]])],
+        [AC_MSG_RESULT([yes])],
+        [AC_MSG_RESULT([no]); CPPFLAGS="${temp_check_cppflags}"])
+])# AC_CHECK_CPPFLAGS
+
+dnl LIBRARY TEST: OpenGL support
+AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
+AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
+AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )
+
+dnl LIBRARY TEST: Direct3D 9 header support
+AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
+AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )
+
+dnl Utility function ============================
+
+# AC_CHECK_CXXFLAGS(ADDITIONAL-CXXFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
+#
+# checks whether the $(CXX) (c++) compiler accepts the ADDITIONAL-CXXFLAGS
+# if so, they are added to the CXXFLAGS
+AC_DEFUN([AC_CHECK_CXXFLAGS],
+[
+  AC_MSG_CHECKING([whether $CXX accepts "$1"])
+cat > conftest.c++ << EOF
+int main(){
+  return 0;
+}
+EOF
+if $CXX $CPPFLAGS $CXXFLAGS -Werror -c -o conftest.o conftest.c++ [$1] > /dev/null 2>&1
+then
+  AC_MSG_RESULT([yes])
+  CXXFLAGS="${CXXFLAGS} [$1]"
+  AC_CHECK_CPPFLAGS([$1])
+  [$2]
+else
+  AC_MSG_RESULT([no])
+  [$3]
+fi
+])# AC_CHECK_CXXFLAGS
+
+dnl End Utility function ============================
+
+dnl Detect the canonical host and target build environment
+AC_CANONICAL_HOST
+AC_CANONICAL_BUILD
+
+dnl Setup for automake
+AM_INIT_AUTOMAKE([foreign subdir-objects])
+AC_CONFIG_HEADER(config.h)
+AH_BOTTOM([/*
+  Define HAS_CDIRECTLPT as 1 if C_DIRECTLPT is defined (as 1) *and* parallel
+  pass-through is available on the current platform. It is only available on
+  x86{_64} with Windows or BSD, and on Linux.
+  We cannot override the value of C_DIRECTLPT, because configure will replace
+  "#undef C_DIRECTLPT" or "#define C_DIRECTLPT 0" with "#define C_DIRECTLPT 1".
+*/
+#ifdef C_DIRECTLPT
+#if ((defined __i386__ || defined __x86_64__ || defined _M_IX86 || defined _M_X64) && \
+     (defined WIN32 || defined BSD || defined __CYGWIN__)) || \
+     /* WIN32 is not defined by default on Cygwin */ \
+    defined LINUX /* Linux, including non-x86 (e.g. Raspberry Pi) */
+#define HAS_CDIRECTLPT 1
+#endif
+#endif // C_DIRECTLPT
+#ifndef HAS_CDIRECTLPT
+#define HAS_CDIRECTLPT 0
+#endif])
+
+dnl Checks for programs.
+AC_PROG_MAKE_SET
+AC_PROG_CC
+AC_PROG_CPP
+AC_PROG_CXX
+AC_PROG_OBJCXX
+AC_PROG_INSTALL
+AC_CHECK_TOOL(AR, ar)
+AC_PROG_RANLIB
+AC_PREFIX_DEFAULT([/usr/local])
+
+dnl this code needs large file support on 32-bit systems
+AC_SYS_LARGEFILE
+
+#Check for big endian machine, should #define WORDS_BIGENDIAN if so
+AC_C_BIGENDIAN
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_C_INLINE
+AC_TYPE_SIZE_T
+AC_STRUCT_TM
+
+dnl some semi complex check for sys/socket so it works on darwin as well
+AC_CHECK_HEADERS([stdlib.h sys/types.h])
+AC_CHECK_HEADERS([sys/socket.h  netinet/in.h pwd.h], [], [],
+[#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+])
+
+dnl C++11 is mandatory in this codebase.
+dnl C++14 is optional at this time, will eventually become mandatory.
+
+dnl AC_CHECK_CXXFLAGS will prepend gnu++11 to CXXFLAGS if supported, for us.
+OLDCFLAGS="$CFLAGS"
+OLDCPPFLAGS="$CPPFLAGS"
+OLDCXXFLAGS="$CXXFLAGS"
+
+AC_MSG_CHECKING([checking for C++14 support])
+AC_CHECK_CXXFLAGS([ -std=gnu++14 ], [  ], [
+    warn_cpp11=1
+])
+
+CXXFLAGS="$OLDCXXFLAGS"
+CPPFLAGS="$OLDCPPFLAGS"
+CFLAGS="$OLDCFLAGS"
+
+AC_MSG_CHECKING([checking for C++11 support])
+AC_CHECK_CXXFLAGS([ -std=gnu++11 ], [  ], [
+    warn_cpp0x=1
+])
+
+CXXFLAGS="$OLDCXXFLAGS"
+CPPFLAGS="$OLDCPPFLAGS"
+CFLAGS="$OLDCFLAGS"
+
+if test x$warn_cpp0x = x1; then
+    AC_MSG_ERROR([ Your compiler must support C++11 or better ])
+fi
+
+dnl Allow devs to force compile as C++11 as long as this code supports C++11 as a baseline
+AC_ARG_ENABLE(force-cxx11,AC_HELP_STRING([--enable-force-cxx11],[Force compile as C++11]),force_cxx11=yes)
+
+if test x$warn_cpp11 = x1; then
+    AC_MSG_WARN([ Your compiler does not support C++14. Currently it is optional. At some point in the future, it will be required ])
+    CFLAGS="$CFLAGS -std=gnu11";
+    CXXFLAGS="$CXXFLAGS -std=gnu++11";
+elif test x$force_cxx11 = xyes; then
+    CFLAGS="$CFLAGS -std=gnu11";
+    CXXFLAGS="$CXXFLAGS -std=gnu++11";
+else
+    AC_MSG_WARN([ DOSBox-X is still intended to support compilation as C++11. If you add new code please make sure it works as C++11 by running ./configure with --enable-force-cxx11 ])
+    CFLAGS="$CFLAGS -std=gnu11"; # no such "gnu14"
+    CXXFLAGS="$CXXFLAGS -std=gnu++14";
+fi
+
+dnl Allow the SDL drawn menu to be enabled on Windows or macOS instead of their native menu system.
+AH_TEMPLATE(C_FORCE_MENU_SDLDRAW,[Define to 1 to force SDL-drawn menus])
+AC_ARG_ENABLE(force-menu-sdldraw,AC_HELP_STRING([--enable-force-menu-sdldraw],[Force SDL drawn menus]),enable_force_menu_sdldraw=yes)
+
+dnl This is how the build script can specify a HX DOS extender target
+AH_TEMPLATE(C_HX_DOS,[Define to 1 to target HX DOS])
+AC_ARG_ENABLE(hx-dos,AC_HELP_STRING([--enable-hx-dos],[Enable HX target]),enable_hx=yes)
+
+dnl This is how the build script can use libopencow for win9x unicode 
+# AH_TEMPLATE(C_OPENCOW,[Define to 1 to enable opencow])
+AC_ARG_ENABLE(opencow,AC_HELP_STRING([--enable-opencow],[Enable OpenCOW]),enable_opencow=yes)
+
+dnl Disable SDLnet for win9x builds
+AC_ARG_ENABLE(sdlnet,AC_HELP_STRING([--disable-sdlnet],[Disable SDLNet]),disable_sdl_net=yes)
+
+dnl Let me know if you're targeting Emscripten
+AH_TEMPLATE(C_EMSCRIPTEN,[Define to 1 to target Emscripten])
+AC_ARG_ENABLE(emscripten,AC_HELP_STRING([--enable-emscripten],[Enable Emscripten target]),enable_emscripten=$enableval,enable_emscripten=no)
+
+dnl Allow disabling X11 integration if your platform doesn't support it
+AC_ARG_ENABLE(x11,AC_HELP_STRING([--disable-x11],[Don't enable X11 integration]))
+
+dnl Optimize for speed by default
+AC_ARG_ENABLE(optimize,AC_HELP_STRING([--disable-optimize],[Don't enable compiler optimizations]))
+
+dnl FIXME: Remove default "-O2" set by some autotools versions. TODO: check availability of sed.
+CFLAGS=["`echo $CFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]
+CXXFLAGS=["`echo $CXXFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]
+
+if test x$enable_optimize != xno; then
+    if test x$enable_emscripten = xyes; then
+	    CFLAGS="$CFLAGS -Os"
+	    CXXFLAGS="$CXXFLAGS -Os"
+    else
+	    CFLAGS="$CFLAGS -O2"
+	    CXXFLAGS="$CXXFLAGS -O2"
+    fi
+fi
+
+if test x$enable_emscripten = xyes; then
+	AC_DEFINE(C_EMSCRIPTEN,1,[Targeting Emscripten])
+  AC_DEFINE(C_DIRECTSERIAL, 0, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+fi
+
+dnl Some stuff for the icon.
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+    if test x$enable_hx = xyes; then
+        CXXFLAGS="$CXXFLAGS -DHX_DOS"
+        AC_DEFINE(C_HX_DOS,1,[Targeting HX DOS extender])
+    fi
+    ;;
+esac
+
+if test x$enable_force_menu_sdldraw = xyes; then
+    CXXFLAGS="$CXXFLAGS -DFORCE_SDLDRAW"
+    AC_DEFINE(C_FORCE_MENU_SDLDRAW,1,[Force SDL drawn menus])
+fi
+
+dnl TEST: Environ can be included
+AC_MSG_CHECKING(if environ can be included)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>]],[[*environ;]])],
+[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_INCLUDED,1,[environ can be included])],AC_MSG_RESULT(no))
+
+dnl TEST: Environ can be linked
+AC_MSG_CHECKING(if environ can be linked)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char ** environ;]],[[*environ;]])],
+[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_LINKED,1,[environ can be linked])],AC_MSG_RESULT(no))
+
+dnl TEST: dirent includes d_type
+AC_MSG_CHECKING([if dirent includes d_type])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#include <sys/types.h>
+#include <dirent.h>
+void blah(){
+struct dirent d_test;
+d_test.d_type = 0;
+}])],[AC_MSG_RESULT(yes);AC_DEFINE(DIRENT_HAS_D_TYPE,1,[struct dirent has d_type])],AC_MSG_RESULT(no))
+
+dnl TEST: Check for powf
+AC_MSG_CHECKING(for powf in libm);
+LIBS_BACKUP=$LIBS;
+LIBS="$LIBS -lm";
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],[[
+        powf(1.0f, 1.0f);
+]])], [AC_MSG_RESULT(yes)], [AC_DEFINE([DB_HAVE_NO_POWF],[1],[libm does not include powf])])
+LIBS=$LIBS_BACKUP
+
+dnl Look for clock_gettime, a DB_HAVE_CLOCK_GETTIME is set when present
+AH_TEMPLATE([DB_HAVE_CLOCK_GETTIME],[Determines if the function clock_gettime is available.])
+AC_SEARCH_LIBS([clock_gettime], [rt] , [found_clock_gettime=yes], [found_clock_gettime=no])
+if test x$found_clock_gettime = xyes; then
+  AC_DEFINE(DB_HAVE_CLOCK_GETTIME)
+fi
+
+dnl TEST: Check if the compiler support attributes
+AH_TEMPLATE([C_HAS_ATTRIBUTE],[Determines if the compilers supports attributes for structures.])
+AC_MSG_CHECKING(if compiler allows __attribute__)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+typedef struct { } __attribute__((packed)) junk;]],
+[[ ]])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_ATTRIBUTE)],AC_MSG_RESULT(no))
+
+dnl TEST: Check if the compiler supports certain attributes
+OLDCFLAGS="$CFLAGS"
+CFLAGS="-Werror"
+
+AH_TEMPLATE([C_ATTRIBUTE_ALWAYS_INLINE],[Determines if the compilers supports always_inline attribute.])
+AC_MSG_CHECKING(if compiler allows __attribute__((always_inline)) )
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([ inline void __attribute__((always_inline)) test(){}
+])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_ALWAYS_INLINE)],AC_MSG_RESULT(no))
+
+AH_TEMPLATE([C_ATTRIBUTE_FASTCALL],[Determines if the compilers supports fastcall attribute.])
+AC_MSG_CHECKING(if compiler allows __attribute__((fastcall)) )
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([ void __attribute__((fastcall)) test(){}
+])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_FASTCALL)],AC_MSG_RESULT(no))
+
+CFLAGS="$OLDCFLAGS"
+
+dnl TEST: Check if the compiler supports __builtin_expect
+#Switch language to c++
+AC_LANG_PUSH(C++)
+AH_TEMPLATE([C_HAS_BUILTIN_EXPECT],[Determines if the compilers supports __builtin_expect for branch prediction.])
+AC_MSG_CHECKING(if compiler allows __builtin_expect)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[
+int x=10;if( __builtin_expect ((x==1),0) ) ;
+]])], [ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_BUILTIN_EXPECT)],AC_MSG_RESULT(no))
+#switch language back
+AC_LANG_POP(C++)
+
+dnl Check for mach_vm_remap (Darwin)
+AH_TEMPLATE(C_HAVE_MACH_VM_REMAP,[Define to 1 if you have the mach_vm_remap function])
+AC_CHECK_HEADER([mach/mach.h], [
+AC_CHECK_FUNC([mach_vm_remap],[AC_DEFINE(C_HAVE_MACH_VM_REMAP,1)])
+])
+
+dnl Check for mprotect. Needed for 64 bits linux 
+AH_TEMPLATE(C_HAVE_MPROTECT,[Define to 1 if you have the mprotect function])
+AC_CHECK_HEADER([sys/mman.h], [
+AC_CHECK_FUNC([mprotect],[AC_DEFINE(C_HAVE_MPROTECT,1)])
+])
+
+dnl Check for memfd_create, for dynamic core. You need the glibc version, not just the syscall.
+AH_TEMPLATE(C_HAVE_MEMFD_CREATE,[Define to 1 if you have the memfd_create function])
+AC_CHECK_HEADER([sys/mman.h], [
+AC_CHECK_FUNC([memfd_create],[AC_DEFINE(C_HAVE_MEMFD_CREATE,1)])
+])
+
+dnl Check for posix_memalign
+AH_TEMPLATE(C_HAVE_POSIX_MEMALIGN,[Define to 1 if you have the posix_memalign function])
+AC_CHECK_HEADER([stdlib.h], [
+AC_CHECK_FUNC([posix_memalign],[AC_DEFINE(C_HAVE_POSIX_MEMALIGN,1)])
+])
+
+dnl Check for mmap
+AH_TEMPLATE(C_HAVE_MMAP,[Define to 1 if you have the mmap function])
+AC_CHECK_HEADER([sys/mman.h], [
+AC_CHECK_FUNC([mmap],[AC_DEFINE(C_HAVE_MMAP,1)])
+])
+
+dnl Check for realpath. Used on Linux
+AC_CHECK_FUNCS([realpath])
+
+dnl Setpriority
+AH_TEMPLATE(C_SET_PRIORITY,[Define to 1 if you have setpriority support])
+AC_MSG_CHECKING(for setpriority support)
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <sys/resource.h>
+int main(int argc,char **argv) {
+	return setpriority (PRIO_PROCESS, 0,PRIO_MIN+PRIO_MAX);
+};
+])],AC_MSG_RESULT(yes);AC_DEFINE(C_SET_PRIORITY,1),AC_MSG_RESULT(no))
+
+dnl Some target detection and actions for them
+case "$host" in
+    *-*-darwin* | *-*-openbsd*)
+       dnl El Capitan's refusal to allow sudo make install to /usr/include, and the failure of most open source to
+       dnl include from /usr/local/include is irritating and tiresome...
+       CFLAGS="$CFLAGS -I/usr/local/include"
+       CPPFLAGS="$CPPFLAGS -I/usr/local/include"
+       ;;
+esac
+
+if test x$enable_emscripten = xyes; then
+    CXXFLAGS="$CXXFLAGS"
+else
+    dnl Some default CPU flags
+    case "$host_cpu" in
+        x86_64 | amd64)
+        # SSE is part of the x86_64 ABI
+        CXXFLAGS="$CXXFLAGS -msse"
+        ;;
+    esac
+fi
+
+dnl Some needed libaries for OS2
+dnl perharps join this with the other target depended checks. move them upwards
+if test x$host = xi386-pc-os2-emx ; then
+    CXXFLAGS="$CXXFLAGS -Zmt"
+    LDFLAGS="$LDFLAGS -Zomf -Zmt"
+fi
+
+dnl I would like to know of any concerns given by the C++ compiler.
+dnl Clang/LLVM already does this to some degree, let's get GCC to do it too.
+AC_CHECK_CXXFLAGS([ -Wall ])
+AC_CHECK_CXXFLAGS([ -Wextra ])
+AC_CHECK_CXXFLAGS([ -Wunused ])
+AC_CHECK_CXXFLAGS([ -pedantic ])
+AC_CHECK_CXXFLAGS([ -Wno-error=format-security ])     # imfc.cpp and later versions of GCC, see https://github.com/joncampbell123/dosbox-x/issues/4436
+#AC_CHECK_CXXFLAGS([ -Wconversion ])      DO NOT ENABLE. THIS WARNING IS WAY TOO PEDANTIC TO BE USEFUL, EXCEPT FOR SPECIFIC CASES
+#AC_CHECK_CXXFLAGS([ -Wsign-conversion ])
+AC_CHECK_CXXFLAGS([ -Wlogical-op ])
+AC_CHECK_CXXFLAGS([ -Wsign-promo ])
+AC_CHECK_CXXFLAGS([ -Wconversion-null ])
+#AC_CHECK_CXXFLAGS([ -Woverloaded-virtual ])    NOT TOO USEFUL
+AC_CHECK_CXXFLAGS([ -Wno-deprecated-declarations ])
+
+dnl Let GCC 7.3.x know that the "fall through" switch cases in this codebase
+dnl are often intentional.
+AC_CHECK_CXXFLAGS([ -Wno-implicit-fallthrough ])
+
+dnl Stop reporting "type punning" warnings, I'm sick of hearing about it.
+AC_CHECK_CXXFLAGS([ -Wno-strict-aliasing ])
+
+dnl other
+AC_CHECK_CXXFLAGS([ -Wno-missing-field-initializers ])
+AC_CHECK_CXXFLAGS([ -Wno-format-zero-length ])
+
+dnl Clang/LLVM warning: don't care the address of a member may be unaligned, unless targeting ARM!
+AC_CHECK_CXXFLAGS([ -Wno-address-of-packed-member ])
+dnl Clang/LLVM warning: don't care about int to void*, since void* is either same size or larger
+AC_CHECK_CXXFLAGS([ -Wno-int-to-void-pointer-cast ])
+
+dnl Some stuff for the icon and other makefile platform stuff.
+dnl Slightly double with the above, but that deals more with compiled features.
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       dnl Some stuff for the ico
+       AC_CHECK_TOOL(WINDRES, windres, :)
+       LDFLAGS="-static -static-libgcc -static-libstdc++ $LDFLAGS"
+       DBPLATFORM="win"
+    ;;
+    *-*-darwin*)
+       WINDRES=":"
+       DBPLATFORM="mac"
+    ;;
+    *)
+       WINDRES=":"
+       DBPLATFORM="other"
+    ;;
+esac
+       AM_CONDITIONAL(HAVE_WINDRES, test "x$WINDRES" != "x:")
+       AM_CONDITIONAL(MACOSX, test "x$DBPLATFORM" = "xmac")
+       AC_SUBST(WINDRES)
+
+dnl LIBRARY TEST: SDL 2.x
+SDL2_VERSION=2.0.5
+AM_PATH_SDL2($SDL2_VERSION)
+
+dnl LIBRARY TEST: SDL 1.x
+SDL_VERSION=1.2.0
+AM_PATH_SDL($SDL_VERSION)
+
+dnl LIBRARY USE: SDL selection
+if test -n "$SDL2_LIBS"; then
+    LIBS="$LIBS $SDL2_LIBS"
+    CPPFLAGS="$CPPFLAGS $SDL2_CFLAGS"
+else
+  if test -n "$SDL_LIBS"; then
+    LIBS="$LIBS $SDL_LIBS"
+    CPPFLAGS="$CPPFLAGS $SDL_CFLAGS"
+  else
+    AC_MSG_ERROR([SDL 1.x or SDL 2.x is required to compile this program])
+  fi
+fi
+
+AH_TEMPLATE(C_GAMELINK,[Define to 1 to enable game link headless mode])
+AC_CHECK_LIB(rt, main, have_rt_lib=yes, have_rt_lib=no , )
+AC_ARG_ENABLE(gamelink,AC_HELP_STRING([--disable-gamelink],[Disable headless game link output mode (only for SDL2)]),,enable_gamelink=yes)
+AC_MSG_CHECKING(whether gamelink is enabled) 
+if test x$enable_gamelink = xyes; then
+  if test "x$SDL2_LIBS" = "x"; then
+    AC_MSG_RESULT(no (SDL2 missing))
+  else
+    AC_MSG_RESULT(yes)
+    C_GAMELINK=1
+    AC_DEFINE(C_GAMELINK,1)
+  fi
+else
+  AC_MSG_RESULT(no)
+fi
+AM_CONDITIONAL([C_GAMELINK], [test "x$C_GAMELINK" = x1])
+
+
+dnl FEATURE: Whether to use OpenGL
+AH_TEMPLATE(C_OPENGL,[Define to 1 to use opengl display output support])
+AC_ARG_ENABLE(opengl,AC_HELP_STRING([--disable-opengl],[Disable opengl support]),enable_opengl=$enableval,enable_opengl=yes)
+AC_MSG_CHECKING(whether opengl display output will be enabled)
+
+# We need to do this before any other AC_CHECK_LIB runs just to make sure
+# linking doesn't fail if SDL is using OpenGL
+if test x$enable_opengl = xyes; then
+case "$host" in
+    *-*-darwin*)
+       AC_MSG_RESULT(yes)
+       LIBS="$LIBS -framework OpenGL"
+       AC_DEFINE(C_OPENGL,1)
+       ;;
+    *)
+       pkg-config --exists gl; RES=$?
+       if test x$RES = x0; then
+         AC_MSG_RESULT(yes)
+         CFLAGS="$CFLAGS "`pkg-config gl --cflags`
+         CPPFLAGS="$CPPFLAGS "`pkg-config gl --cflags`
+         LIBS="$LIBS "`pkg-config gl --libs`
+         AC_DEFINE(C_OPENGL,1)
+       elif test x$have_gl_h = xyes -a x$have_gl_lib = xyes ; then
+         AC_MSG_RESULT(yes)
+         LIBS="$LIBS -lGL"
+         AC_DEFINE(C_OPENGL,1)
+       elif test x$have_gl_h = xyes -a x$have_opengl32_lib = xyes ; then
+         AC_MSG_RESULT(yes)
+         LIBS="$LIBS -lopengl32"
+         AC_DEFINE(C_OPENGL,1)
+       else
+         AC_MSG_RESULT(no)
+       fi
+       ;;
+esac
+fi
+
+# FIXME: Arrggh we need the WHOLE PATH
+pwd=`realpath $srcdir`
+if [[ -z "$pwd" ]]; then pwd=`pwd`; fi
+
+CFLAGS="$CFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
+LDFLAGS="$LDFLAGS -L$pwd/vs/sdlnet/linux-host/lib"
+CPPFLAGS="$CPPFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
+CXXFLAGS="$CXXFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
+
+if test x$enable_emscripten != xyes; then
+dnl Some target detection and actions for them
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       LIBS="$LIBS -lwinmm -ldsound -limm32 -lole32 -loleaut32 -lversion -lsetupapi"
+       CXXFLAGS="$CXXFLAGS -mno-ms-bitfields"
+       dnl FEATURE: Whether to support direct parallel port pass-through
+       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       ;;
+    *-*-darwin*)
+       dnl We have a problem here: both Mac OS X and Darwin report 
+       dnl the same signature "powerpc-apple-darwin*" - so we have
+       dnl to do more to distinguish them.
+       dnl For now I am lazy and do not add proper detection code.
+       macosx=1
+       if test x$warn_cpp11 = x1; then
+           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++14";
+       else
+           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++11";
+       fi
+       AC_DEFINE(MACOSX, 1, [Compiling on Mac OS X])
+       LIBS="$LIBS -framework Carbon -framework CoreFoundation -framework CoreMIDI -framework AudioUnit -framework AudioToolbox -framework ApplicationServices -framework AppKit -framework IOKit"
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       ;;
+    *-*-linux*)
+       AC_DEFINE(LINUX, 1, [Compiling on GNU/Linux])
+       CXXFLAGS="$CXXFLAGS -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L"
+       LIBS="$LIBS -lrt" # uses shm_* functions which requires librt on Linux
+       dnl FEATURE: Whether to support direct parallel port pass-through
+       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       ;;
+    *-*-haiku*)
+       AC_DEFINE(HAIKU, 1, [Compiling on Haiku])
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       LIBS="$LIBS -lnetwork -lbsd -lbe"
+       ;;
+    *-*-freebsd* | *-*-dragonfly* | *-*-netbsd* | *-*-openbsd*)
+       dnl FEATURE: Whether to support direct parallel port pass-through
+       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
+       dnl Disabled directserial for now. It doesn't do anything without
+       dnl specifying an extra ifdef in directserial_posix.*
+       dnl directserial detection should be rewritten to test for the needed
+       dnl functions and headers. I currently do not know 
+       dnl which ones are needed for BSD
+       AC_DEFINE(BSD, 1, [Compiling on BSD])
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       ;;
+    *-*-os2-emx*)
+       AC_DEFINE(OS2, 1, [Compiling on OS/2 EMX])
+       dnl FEATURE: Whether to support direct serial port pass-through
+       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
+       ;;
+    *-*-riscos*)
+       AC_DEFINE(RISCOS, 1, [Compiling on RISC OS])
+       dnl The following line is required in order to use std::to_string()
+       CXXFLAGS="$CXXFLAGS -D_GLIBCXX_USE_C99=1"
+       ;;
+esac
+
+dnl Fix for FreeBSD not automatically linking to pthread for std::thread
+case "$host" in
+    *-*-freebsd*)
+       LIBS="$LIBS -lpthread"
+    ;;
+esac
+
+dnl OpenBSD/i386 and NetBSD/i386 require linking to libi386.a for i386_iopl() (for initPassthroughIO()).
+dnl OpenBSD/x86_64 requires linking to libamd64.a for amd64_iopl(). NetBSD/x86_64 requires linking to libx86_64.a for x86_64_iopl().
+case "$host" in
+    i*86-*-openbsd* | i*86-*-netbsd*)
+       LIBS="$LIBS -li386"
+       ;;
+    x86_64-*-openbsd*)
+       LIBS="$LIBS -lamd64"
+       ;;
+    x86_64-*-netbsd*)
+       LIBS="$LIBS -lx86_64"
+       ;;
+esac
+fi
+
+AM_CONDITIONAL(MACOSX, test x"$macosx" = x"1")
+AM_CONDITIONAL(EMSCRIPTEN, test x"$enable_emscripten" = x"yes")
+
+dnl The target cpu checks for dynamic cores
+AH_TEMPLATE(C_TARGETCPU,[The type of cpu this target has])
+AC_MSG_CHECKING(for target cpu type) 
+case "$host_cpu" in
+  x86_64 | amd64)
+    AC_DEFINE(C_TARGETCPU,X86_64)
+    AC_MSG_RESULT(x86-64 bit compatible)
+    c_targetcpu="x86_64"
+    c_unalignedmemory=yes
+    ;;
+  i?86)
+    AC_DEFINE(C_TARGETCPU,X86)
+    AC_MSG_RESULT(x86 compatible)
+    c_targetcpu="x86"
+    c_unalignedmemory=yes
+    ;;
+   powerpc*)
+    AC_DEFINE(C_TARGETCPU,POWERPC)
+    AC_MSG_RESULT(Power PC)
+    c_targetcpu="powerpc"
+    c_unalignedmemory=yes
+    ;;
+   m68k*)
+    AC_DEFINE(C_TARGETCPU,M68K)
+    AC_MSG_RESULT(Motorola 68000)
+    c_targetcpu="m68k"
+    c_unalignedmemory=yes
+    ;;
+   armv7*)
+    AC_DEFINE(C_TARGETCPU,ARMV7LE)
+    AC_MSG_RESULT(ARMv7 Little Endian)
+    c_targetcpu="arm"
+    c_unalignedmemory=yes
+    ;;
+   armv6*)
+    AC_DEFINE(C_TARGETCPU,ARMV4LE)
+    AC_MSG_RESULT(ARMv6 Little Endian)
+    c_targetcpu="arm"
+    dnl c_unalignedmemory=yes
+    ;;
+   aarch64)
+    AC_DEFINE(C_TARGETCPU,ARMV8LE)
+    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
+    c_targetcpu="arm"
+    c_unalignedmemory=yes
+    ;;
+   arm) # Mac OS X uname -m says "arm64", for some reason it becomes "arm" ?
+    AC_DEFINE(C_TARGETCPU,ARMV8LE)
+    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
+    c_targetcpu="arm"
+    c_unalignedmemory=yes
+    ;;
+   *)
+    AC_DEFINE(C_TARGETCPU,UNKNOWN)
+    AC_MSG_RESULT(unknown)
+    c_unalignedmemory=no
+    ;;
+esac
+
+dnl TODO: Need GCC to know this code is using C++ lamda functions
+
+dnl LIBRARY TEST: ALSA
+AM_PATH_ALSA(0.9.0, AC_DEFINE(HAVE_ALSA,1,[Define to 1 to use ALSA for MIDI]) , : )
+
+dnl Some stuff for the icon.
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       dnl MinGW puts ncurses headers in a subdir
+       ncursescfg=`ncursesw6-config --cflags`
+       CXXFLAGS="$CXXFLAGS $ncursescfg"
+       CPPFLAGS="$CPPFLAGS $ncursescfg"
+       CFLAGS="$CFLAGS $ncursescfg"
+    ;;
+    *)
+       WINDRES=":"
+    ;;
+esac
+
+
+dnl LIBRARY TEST: curses
+AC_CHECK_HEADER(curses.h,have_curses_h=yes,)
+AC_CHECK_LIB(curses, initscr, curses_lib=curses, , )
+AC_CHECK_LIB(ncurses, initscr, curses_lib=ncurses, , )
+AC_CHECK_LIB(pdcurses, initscr, curses_lib=pdcurses, , )
+# Check if this system's ncurses uses a separate tinfo library
+AC_CHECK_LIB(tinfo, nodelay,
+	     if test x$curses_lib = xncurses ; then
+	       LIBS="$LIBS -ltinfo";
+	     fi)
+
+dnl LIBRARY TEST: libzlib
+AC_CHECK_HEADER(zlib.h,have_zlib_h=yes,)
+AC_CHECK_LIB(z, inflateEnd, have_zlib_lib=yes, ,)
+
+dnl LIBRARY TEST: libpng
+AC_CHECK_HEADER(png.h,have_png_h=yes,)
+AC_CHECK_LIB(png, png_get_io_ptr, have_png_lib=yes, ,-lz)
+
+dnl LIBRARY TEST: libpcap
+AC_CHECK_HEADER(pcap.h,have_pcap_h=yes,)
+AC_CHECK_LIB(pcap, pcap_open_live, have_pcap_lib=yes, ,-lz)
+
+dnl LIBRARY TEST: libslirp
+AC_CHECK_HEADER(slirp/libslirp.h,have_slirp_h=yes,)
+AC_CHECK_LIB(slirp, slirp_input, have_slirp_lib=yes, ,-lz)
+
+dnl LIBRARY TEST: libiconv
+AC_CHECK_HEADER(iconv.h,have_iconv_h=yes,)
+dnl TEST: check if iconv uses const char
+AC_MSG_CHECKING([whether iconv uses const char**])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#include <iconv.h>
+size_t iconv(iconv_t, const char **restrict, size_t *restrict, char **restrict, size_t *restrict);
+])], AC_DEFINE(ICONV_CONST_CHAR, 1) AC_MSG_RESULT(yes), AC_MSG_RESULT(no))
+AH_TEMPLATE(ICONV_CONST_CHAR,[Whether iconv uses const char**])
+
+dnl LIBRARY TEST: SDLnet
+AC_CHECK_HEADER(SDL_net.h,have_sdl_net_h=yes,)
+AC_CHECK_LIB(SDL2_net, SDLNet_Init, have_sdl2_net_lib=yes, , )
+AC_CHECK_LIB(SDL_net, SDLNet_Init, have_sdl_net_lib=yes, , )
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#include <SDL_config.h>
+#ifndef SDL_VIDEO_DRIVER_X11
+#error SDL_VIDEO_DRIVER_X11
+#endif
+void test(){}
+])], , enable_x11=no)
+if test x$enable_x11 != xno; then
+  dnl LIBRARY TEST: X11 Xlib support
+  AC_CHECK_LIB(X11, main, have_x11_lib=yes, have_x11_lib=no, )
+  AC_CHECK_LIB(Xrandr, XRRGetCrtcInfo, have_xrandr_lib=yes, have_xrandr_lib=no, )
+  AC_CHECK_HEADER(X11/XKBlib.h, have_x11_h=yes, have_x11_h=no, )
+
+  dnl Compile test will fail for XKBrules.h if we do not also include XKBlib.h
+  dnl Hope your compiler supports the GCC style -include option!
+  if test x$have_x11_h = xyes; then
+    save_CPPFLAGS=$CPPFLAGS
+    CPPFLAGS="$CPPFLAGS -include X11/XKBlib.h"
+
+    AC_CHECK_HEADER(X11/extensions/XKBrules.h, have_x11_ext_xkbrules_h=yes, have_x11_ext_xkbrules_h=no, )
+    AC_CHECK_HEADER(X11/extensions/XKBfile.h, have_xkbfile_h=yes, have_xkbfile_h=no, )
+
+    CPPFLAGS=$save_CPPFLAGS
+  fi
+fi
+
+dnl LIBRARY TEST: Fluidsynth support
+AC_CHECK_HEADER(fluidsynth.h,have_fluidsynth_h=yes,)
+AC_CHECK_LIB(fluidsynth, fluid_synth_sysex, have_fluidsynth_lib=yes,,)
+
+dnl LIBRARY TEST: FreeType2
+AH_TEMPLATE(C_FREETYPE,[Define to 1 to enable freetype support])
+AC_ARG_ENABLE(freetype,AC_HELP_STRING([--disable-freetype],[Disable freetype support]),enable_freetype=$enableval,enable_freetype=yes)
+AM_CONDITIONAL(C_FREETYPE, test "x$enable_freetype" = "xyes")
+if test x$enable_freetype = xyes; then
+  AC_MSG_CHECKING(for freetype)
+  if test x$INTERNAL_FREETYPE = x1; then
+    # CFLAGS and LDFLAGS were already updated by build-macos
+    AC_DEFINE(C_FREETYPE,1)
+    AC_MSG_RESULT(yes)
+  else
+    pkg-config --exists freetype2; RES=$?
+    if test x$RES = x0; then
+      CFLAGS="$CFLAGS "`pkg-config freetype2 --cflags`
+      CPPFLAGS="$CPPFLAGS "`pkg-config freetype2 --cflags`
+      LIBS="$LIBS "`pkg-config freetype2 --libs`
+      AC_DEFINE(C_FREETYPE,1)
+      AC_MSG_RESULT(yes)
+    else
+      enable_freetype=no
+      AC_MSG_RESULT(no)
+    fi
+  fi
+fi
+
+dnl LIBRARY TEST: FFMPEG support
+pkg-config --exists libavcodec; RES=$?
+if test x$RES = x0; then
+  have_avcodec_h=yes
+  have_ffmpeg=yes
+else
+  have_avcodec_h=no
+  have_ffmpeg=no
+fi
+
+dnl LIBRARY TEST: OpenGL support
+AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
+AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
+AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )
+
+dnl LIBRARY TEST: Direct3D 9 header support
+AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
+AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )
+
+dnl ================== SDL net special test for OS/2
+if test x$host = xi386-pc-os2-emx ; then
+  LIBS_BACKUP=$LIBS;
+  LIBS="$LIBS -lSDL_Net";
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <SDL_Net.h>]],[[
+	SDLNet_Init ();
+  ]])], [AC_MSG_RESULT(yes); have_sdl_net_lib=yes], AC_MSG_RESULT(no))
+  LIBS=$LIBS_BACKUP
+fi
+
+dnl FEATURE: PRINTER (requires FreeType2)
+AH_TEMPLATE(C_PRINTER,[Define to 1 to enable printer emulation])
+AC_ARG_ENABLE(printer,AC_HELP_STRING([--disable-printer],[disable printer emulation]),enable_printer=$enableval,enable_printer=yes)
+AM_CONDITIONAL(C_PRINTER, test "x$enable_printer" = "xyes")
+if test x$enable_freetype = xyes; then
+  if test x$enable_printer = xyes; then
+    AC_DEFINE(C_PRINTER,1)
+  fi
+fi
+
+dnl FEATURE: xBRZ
+AH_TEMPLATE(C_XBRZ,[Define to 1 to enable XBRZ scaler])
+AC_ARG_ENABLE(xbrz,AC_HELP_STRING([--enable-xbrz],[compile with xBRZ scaler (default yes)]),enable_xbrz=$enableval,enable_xbrz=yes)
+AM_CONDITIONAL(C_XBRZ, test "x$enable_xbrz" = "xyes")
+if test x$enable_emscripten != xyes; then
+  if test x$enable_xbrz = xyes; then
+    AC_DEFINE(C_XBRZ,1)
+  fi
+fi
+
+dnl FEATURE: xBRZ
+AH_TEMPLATE(C_SCALER_FULL_LINE,[Define to 1 to alter the simpler render scalers to operate only on the full scanline instead of detecting differences. This is a performance adjustment for slow or embedded systems])
+AC_ARG_ENABLE(scaler-full-line,AC_HELP_STRING([--enable-scaler-full-line],[scaler render full line instead of detecting changes, for slower systems]),enable_scaler_full_line=$enableval,enable_scaler_full_line=no)
+AM_CONDITIONAL(C_SCALER_FULL_LINE, test "x$enable_scaler_full_line" = "xyes")
+if test x$enable_scaler_full_line = xyes; then
+  AC_DEFINE(C_SCALER_FULL_LINE,1)
+fi
+
+dnl FEATURE: MIDI through ALSA
+AC_ARG_ENABLE(alsa-midi,
+AC_HELP_STRING([--enable-alsa-midi],[compile with alsa midi support (default yes)]),
+[ case "${enableval}" in
+ yes) alsa_midi=true;;
+ no)  alsa_midi=false;;
+esac],
+[alsa_midi=true])
+if test x$alsa_midi = xtrue ; then 
+  CXXFLAGS="$CXXFLAGS $ALSA_CFLAGS"
+fi
+
+dnl FEATURE: MT32 (MUNT) emulation
+AH_TEMPLATE(C_MT32,[Define to 1 to enable MT32 emulation])
+AC_ARG_ENABLE(mt32,AC_HELP_STRING([--disable-mt32],[Disable MT32 emulation]),,enable_mt32=yes)
+AC_MSG_CHECKING(whether MT32 emulation will be enabled) 
+
+# test
+if test x$enable_mt32 = xyes ; then 
+  case "$host_cpu" in
+    x86_64 | amd64)
+      AC_MSG_RESULT(yes)
+      AC_DEFINE(C_MT32,1)
+      ;;
+    i?86)
+      AC_MSG_RESULT(yes)
+      AC_DEFINE(C_MT32,1)
+      ;;
+    arm)
+      AC_MSG_RESULT(yes)
+      AC_DEFINE(C_MT32,1)
+      ;;
+    aarch64)
+      AC_MSG_RESULT(yes)
+      AC_DEFINE(C_MT32,1)
+      ;;
+    *)
+      enable_mt32=no
+      AC_MSG_RESULT(no)
+      ;;
+  esac
+else
+  enable_mt32=no
+  AC_MSG_RESULT(no)
+fi 
+AM_CONDITIONAL(C_MT32, test "x$enable_mt32" = "xyes")
+
+dnl On some Linux platforms, std::atomic needs a helper library
+case "$host" in
+  *-*-linux*)
+    case "$host_cpu" in
+      x86_64 | amd64)
+        ;;
+      i?86)
+        ;;
+      *)
+        AC_MSG_CHECKING(whether -latomic is needed)
+        AC_LINK_IFELSE([AC_LANG_SOURCE([
+          #include <atomic>
+          #include <cstdint>
+          std::atomic<std::int64_t> v;
+            int main() {
+              return v;
+            }
+        ])],STD_ATOMIC_NEED_LIBATOMIC=no,STD_ATOMIC_NEED_LIBATOMIC=yes)
+        AC_MSG_RESULT($STD_ATOMIC_NEED_LIBATOMIC)
+        if test "x$STD_ATOMIC_NEED_LIBATOMIC" = xyes; then
+          LIBS="$LIBS -latomic"
+        fi
+        ;;
+    esac
+    ;;
+esac
+
+dnl NASM (Netwide Assembler)
+AC_PATH_PROG([NASM], [nasm])
+if test -z "$ac_cv_path_NASM"; then
+    AC_MSG_WARN([NASM (netwide assembler) not found, you will not be able to compile the external x86 .asm files if they are modified])
+fi
+
+dnl FEATURE: DEBUG and HEAVY DEBUG options (debugger)
+AH_TEMPLATE(C_DEBUG,[Define to 1 to enable internal debugger, requires libcurses])
+AH_TEMPLATE(C_HEAVY_DEBUG,[Define to 1 to enable heavy debugging, also have to enable C_DEBUG])
+AC_ARG_ENABLE(debug,AC_HELP_STRING([--enable-debug],[Enable debug mode]),[
+   if test x$enable_debug = xno; then
+     AC_MSG_RESULT([Debugger not enabled])
+   elif test x$curses_lib != x -a x$have_curses_h = xyes; then
+     LIBS="$LIBS -l$curses_lib"
+     AC_DEFINE(C_DEBUG,1)
+     if test x$enable_debug = xheavy ; then 
+       AC_DEFINE(C_HEAVY_DEBUG,1)
+     fi
+   else 
+     AC_MSG_ERROR([Can't find curses, which is required for debug mode])
+   fi
+],)
+
+dnl automake 1.14 and upwards rewrite the host to have always 64 bit unless i386 as host is passed
+dnl this can make building a 32 bit executable a bit tricky, as dosbox relies on the host to select the
+dnl dynamic/dynrec core
+AC_MSG_CHECKING([whether Apple user wants to override the build process to produce a 32 bit binary])
+case "$host" in 
+  *-*-darwin*)
+   if test x$c_targetcpu = xx86_64 -a x$c_sizep = x4 ; then
+     AC_MSG_RESULT(yes)
+     AC_DEFINE(C_TARGETCPU,X86)
+     c_targetcpu="x86"
+   else
+     AC_MSG_RESULT(no)
+   fi
+   ;;
+  *)
+   AC_MSG_RESULT([no, not on Apple])
+   ;;
+esac
+
+dnl FEATURE: Whether to enable dynamic core
+AC_ARG_ENABLE(dynamic-core,AC_HELP_STRING([--disable-dynamic-core],[Disable all dynamic cores]),,enable_dynamic_core=yes)
+
+dnl FEATURE: Whether to enable x86 dynamic core
+AH_TEMPLATE(C_DYNAMIC_X86,[Define to 1 to use x86/x64 dynamic cpu core])
+AC_ARG_ENABLE(dynamic-x86,AC_HELP_STRING([--disable-dynamic-x86],[Disable x86/x64 dynamic cpu core]),,enable_dynamic_x86=yes)
+AC_MSG_CHECKING(whether x86 dynamic cpu core will be enabled)
+if test x$enable_dynamic_x86 = xno -o x$enable_dynamic_core = xno; then
+   AC_MSG_RESULT(no)
+elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
+   AC_DEFINE(C_DYNAMIC_X86,1)
+   AC_MSG_RESULT(yes)
+else
+   AC_MSG_RESULT(no)
+fi
+
+dnl FEATURE: Whether to enable recompiling dynamic core
+AH_TEMPLATE(C_DYNREC,[Define to 1 to use recompiling cpu core])
+AC_ARG_ENABLE(dynrec,AC_HELP_STRING([--disable-dynrec],[Disable recompiling cpu core]),,enable_dynrec=yes)
+AC_MSG_CHECKING(whether recompiling cpu core will be enabled) 
+if test x$enable_dynrec = xno -o x$enable_dynamic_core = xno; then 
+   AC_MSG_RESULT(no)
+# test for MIPS32 is missing from this Dynamic Recompiler whitelist
+elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64 -o x$c_targetcpu = xarm; then
+   AC_DEFINE(C_DYNREC,1)
+   AC_MSG_RESULT(yes)
+
+   case "$host" in
+      *-*-openbsd*)
+         AC_MSG_WARN([DOSBox-X will be linked with "wxneeded" to support dynrec core on OpenBSD])
+         LDFLAGS="-Wl,-z,wxneeded $LDFLAGS"
+      ;;
+   esac
+else
+   AC_MSG_RESULT(no)
+fi
+
+dnl FEATURE: Whether to emulate the floating point unit
+AH_TEMPLATE(C_FPU,[Define to 1 to enable floating point emulation])
+AC_ARG_ENABLE(fpu,AC_HELP_STRING([--disable-fpu],[Disable fpu support]),,enable_fpu=yes)
+AC_MSG_CHECKING(whether fpu emulation will be enabled) 
+if test x$enable_fpu = xyes ; then 
+  AC_MSG_RESULT(yes)
+  AC_DEFINE(C_FPU,1)
+else 
+  AC_MSG_RESULT(no)
+fi 
+
+AH_TEMPLATE(C_FPU_X86,[Define to 1 to use a x86/x64 assembly fpu core])
+AC_ARG_ENABLE(fpu-x86,AC_HELP_STRING([--disable-fpu-x86],[Disable x86 assembly fpu core]),,enable_fpu_x86=yes)
+AC_ARG_ENABLE(fpu-x64,AC_HELP_STRING([--disable-fpu-x64],[Disable x64 assembly fpu core]),,enable_fpu_x64=yes)
+AC_MSG_CHECKING(whether the x86/x64 assembly fpu core will be enabled) 
+if test x$enable_fpu_x86 = xno -o x$enable_fpu_x64 = xno; then 
+   AC_MSG_RESULT(no)
+else
+  if test x$enable_fpu = xyes; then
+    if test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
+        AC_DEFINE(C_FPU_X86,1)
+        AC_MSG_RESULT(yes)
+    else
+        AC_MSG_RESULT(no)
+    fi
+  else
+      AC_MSG_RESULT(no)
+  fi
+fi
+
+dnl FEATURE: Whether to enable unaligned memory access
+AH_TEMPLATE(C_UNALIGNED_MEMORY,[Define to 1 to use a unaligned memory access])
+AC_ARG_ENABLE(unaligned_memory,AC_HELP_STRING([--disable-unaligned-memory],[Disable unaligned memory access]),,enable_unaligned_memory=yes)
+AC_MSG_CHECKING(whether to enable unaligned memory access) 
+if test x$enable_unaligned_memory = xyes -a x$c_unalignedmemory = xyes; then 
+  AC_DEFINE(C_UNALIGNED_MEMORY,1)
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_RESULT(no)
+fi
+
+dnl FEATURE: Whether to support SDL net, and emulate modem and IPX connections
+AH_TEMPLATE(C_SDL_NET,[Indicate whether SDL_net is present])
+AH_TEMPLATE(C_MODEM,[Define to 1 to enable internal modem support, requires SDL_net])
+AH_TEMPLATE(C_IPX,[Define to 1 to enable IPX over Internet networking, requires SDL_net])
+
+case "$host" in
+  *-*-cygwin* | *-*-mingw32*)
+    if test x$have_sdl_net_h = xyes; then
+      have_sdl_net_lib=yes
+    fi
+  ;;
+esac
+dnl enable SDL2 net if SDL2
+if test -n "$SDL2_LIBS"; then
+ if test x$disable_sdl_net = xyes ; then
+  AC_MSG_WARN([SDL_net is disabled in parameters])
+ elif test x$have_sdl2_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
+  LIBS="$LIBS -lSDL2_net"
+  AC_DEFINE(C_SDL_NET,1)
+  AC_DEFINE(C_MODEM,1)
+  AC_DEFINE(C_IPX,1)
+  have_sdl_net=yes
+ elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
+  LIBS="$LIBS -lSDL_net"
+  AC_DEFINE(C_SDL_NET,1)
+  AC_DEFINE(C_MODEM,1)
+  AC_DEFINE(C_IPX,1)
+  have_sdl_net=yes
+ else
+  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
+ fi
+else
+ if test x$disable_sdl_net = xyes ; then
+  AC_MSG_WARN([SDL_net is disabled in parameters])
+ elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
+  LIBS="$LIBS -lSDL_net"
+  AC_DEFINE(C_SDL_NET,1)
+  AC_DEFINE(C_MODEM,1)
+  AC_DEFINE(C_IPX,1)
+  have_sdl_net=yes
+ else 
+  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
+ fi
+fi
+
+dnl FEATURE: Whether to support libz, and enable snapshots
+AH_TEMPLATE(C_LIBZ,[Define to 1 if you have libz])
+if test x$have_zlib_lib = xyes -a x$have_zlib_h = xyes ; then
+  LIBS="$LIBS -lz"
+  AC_DEFINE(C_LIBZ,1)
+fi
+
+dnl FEATURE: Whether to support libpng, and enable snapshots
+AH_TEMPLATE(C_LIBPNG,[Define to 1 if you have libpng])
+AH_TEMPLATE(C_SSHOT,[Define to 1 to enable screenshots, requires libpng])
+AC_ARG_ENABLE(screenshots,AC_HELP_STRING([--disable-screenshots],[Disable screenshots and movie recording]),,enable_screenshots=yes)
+AC_MSG_CHECKING([whether screenshots will be enabled])
+if test x$enable_screenshots = xyes; then 
+    if test x$have_png_lib = xyes -a x$have_png_h = xyes ; then
+    LIBS="$LIBS -lpng -lz"
+    AC_DEFINE(C_LIBPNG,1)
+    AC_DEFINE(C_SSHOT,1)
+    AC_MSG_RESULT([yes])
+  else
+    AC_MSG_RESULT([no, can't find libpng.])
+  fi
+else
+  AC_MSG_RESULT([no])
+fi
+
+dnl FEATURE: Whether to use libpcap, and enable ethernet pass-through
+AH_TEMPLATE(C_PCAP,[Define to 1 to enable ethernet pass-through, requires libpcap])
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       CFLAGS="$CFLAGS -I$pwd/vs/pcap"
+       CXXFLAGS="$CXXFLAGS -I$pwd/vs/pcap"
+       AC_DEFINE(C_PCAP,1)
+    ;;
+    *)
+       if test x$have_pcap_lib = xyes -a x$have_pcap_h = xyes ; then
+         LIBS="$LIBS -lpcap";
+         AC_DEFINE(C_PCAP,1)
+       else
+         AC_MSG_WARN([Can't find libpcap, ethernet pass-through disabled])
+       fi
+    ;;
+esac
+
+dnl FEATURE: Whether to use libslirp, and enable userspace TCP/IP emulation
+AH_TEMPLATE(C_SLIRP, [Define to 1 to enable userspace TCP/IP emulation, requires libslirp])
+AC_ARG_ENABLE(libslirp,AC_HELP_STRING([--disable-libslirp],[Disable libslirp support]),enable_libslirp=$enableval,enable_libslirp=yes)
+if test x$enable_libslirp = xyes ; then
+  case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       if test x$have_slirp_h = xyes; then
+         have_slirp_lib=yes
+       fi
+    ;;
+  esac
+  if test x$have_slirp_lib = xyes -a x$have_slirp_h = xyes ; then
+    have_slirp=yes
+    AC_DEFINE(C_SLIRP,1)
+    LIBS="$LIBS "`pkg-config slirp --libs`
+    CFLAGS="$CFLAGS "`pkg-config slirp --cflags`
+    CPPFLAGS="$CPPFLAGS "`pkg-config slirp --cflags`
+    case "$host" in
+      *-*-cygwin* | *-*-mingw32*)
+         LIBS="$LIBS -lintl"
+      ;;
+    esac
+  else
+    have_slirp=no
+    AC_MSG_WARN([Can't find libslirp, userspace TCP/IP emulation disabled])
+  fi
+fi
+
+if test x$enable_x11 != xno; then
+  dnl FEATURE: Whether to use X11 XKBlib
+  AH_TEMPLATE(C_X11_XKB,[define to 1 if you have XKBlib.h and X11 lib])
+  AC_MSG_CHECKING(for XKBlib support)
+  if test x$have_x11_lib = xyes -a x$have_x11_h = xyes ; then
+    LIBS="$LIBS -lX11"
+    AC_DEFINE(C_X11_XKB,1)
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
+
+  dnl FEATURE: Whether to use X11 XRandR
+  AH_TEMPLATE(C_X11_XRANDR,[define to 1 if you have XRandr.h and X11 lib])
+  AC_MSG_CHECKING(for XRandR support)
+  if test x$have_xrandr_lib = xyes -a x$have_x11_h = xyes ; then
+    LIBS="$LIBS -lXrandr"
+    AC_DEFINE(C_X11_XRANDR,1)
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
+
+  dnl Having XKBlib doesn't mean XKBrules.h is around
+  if test x$have_x11_ext_xkbrules_h = xyes ; then
+    AH_TEMPLATE(C_X11_EXT_XKBRULES,[define to 1 if XKBrules.h is present])
+    AC_DEFINE(C_X11_EXT_XKBRULES,1)
+  fi
+  if test x$have_xkbfile_h = xyes ; then
+    AH_TEMPLATE(C_X11_XKBFILE,[define to 1 if XKBfile.h is present])
+    AC_DEFINE(C_X11_XKBFILE,1)
+    LIBS="$LIBS -lxkbfile"
+  fi
+
+  if test x$have_x11_h = xyes ; then
+    AH_TEMPLATE(C_X11,[define to 1 to enable X11 support])
+    AC_DEFINE(C_X11,1)
+  fi
+fi
+
+dnl FEATURE: Whether to use Fluidsynth
+AH_TEMPLATE(C_FLUIDSYNTH,[Define to 1 to enable libfluidsynth MIDI synthesis])
+AC_ARG_ENABLE(libfluidsynth,AC_HELP_STRING([--disable-libfluidsynth],[Disable libfluidsynth support]),enable_libfluidsynth=$enableval,enable_libfluidsynth=yes)
+if test x$enable_libfluidsynth = xyes; then
+    case "$host" in
+        *-*-linux*)
+        if test x$have_fluidsynth_h = xyes; then
+          have_fluidsynth_lib=yes
+        fi
+      ;;
+    esac
+    if test x$have_fluidsynth_lib = xyes -a x$have_fluidsynth_h = xyes ; then
+      LIBS="$LIBS -lfluidsynth"
+      AC_DEFINE(C_FLUIDSYNTH,1)
+    else
+      AC_MSG_WARN([libfluidsynth MIDI synthesis not available])
+    fi
+fi
+
+dnl FEATURE: FFMPEG output support
+AH_TEMPLATE(C_AVCODEC,[Define to 1 to use FFMPEG libavcodec for video capture])
+AC_ARG_ENABLE(avcodec,AC_HELP_STRING([--enable-avcodec],[Enable FFMPEG avcodec support]),enable_ffmpeg=$enableval,enable_ffmpeg=yes)
+if test x$enable_ffmpeg = xyes; then
+    if test x$have_ffmpeg = xyes; then
+        if test x$have_avcodec_h = xyes; then
+            PKGS="libavcodec libavformat libavutil libswscale libswresample"
+            CFLAGS="$CFLAGS "`pkg-config $PKGS --cflags`
+            CPPFLAGS="$CPPFLAGS "`pkg-config $PKGS --cflags`
+            LIBS=`pkg-config $PKGS --libs`" $LIBS"
+            AC_MSG_RESULT(yes)
+            AC_DEFINE(C_AVCODEC,1)
+        fi
+    fi
+fi
+
+dnl FEATURE: Whether to use Direct3D 9 output
+AH_TEMPLATE(HAVE_D3D9_H,[Define to 1 to use Direct3D 9 display output support])
+AC_ARG_ENABLE(d3d9,AC_HELP_STRING([--enable-d3d9],[Enable Direct3D 9 support]),enable_d3d9=$enableval,enable_d3d9=no)
+AC_MSG_CHECKING(whether Direct3D 9 display output will be enabled)
+
+dnl FEATURE: Direct3D9 shaders
+AH_TEMPLATE(C_D3DSHADERS,[Define to 1 to use Direct3D shaders])
+AC_ARG_ENABLE(d3d-shaders,AC_HELP_STRING([--enable-d3d-shaders],[Enable Direct3D shaders]),enable_d3d_shaders=$enableval,enable_d3d_shaders=no)
+
+if test x$enable_d3d9 = xyes; then
+    case "$host" in
+        *-*-cygwin* | *-*-mingw32*)
+        if test x$have_d3d9_h = xyes -a x$have_d3dx9math_h = xyes ; then
+	    do_d3d=1
+            AC_MSG_RESULT(yes)
+            AH_TEMPLATE(C_DIRECT3D,[Define to 1 to enable Direct3D 9 display output support])
+            AC_DEFINE(HAVE_D3D9_H,1)
+            AC_DEFINE(C_DIRECT3D,1)
+            if test x$enable_d3d_shaders = xyes; then
+                AC_DEFINE(C_D3DSHADERS,1)
+            fi
+        else
+            AC_MSG_RESULT(no)
+        fi
+        ;;
+    *)
+        AC_MSG_RESULT(no)
+        ;;
+    esac
+else
+  AC_MSG_RESULT(no)
+fi
+
+AM_CONDITIONAL(C_DIRECT3D, test x"$do_d3d" = x"1")
+
+AH_TEMPLATE(C_ICONV,[Define to 1 to use iconv])
+if test x$have_iconv_h = xyes; then
+    AC_DEFINE(C_ICONV,1)
+    AC_MSG_CHECKING([whether we must link against -liconv])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+    #include <iconv.h>
+    iconv_t wrap_open(const char *tocode, const char *fromcode) {
+      return iconv_open(tocode, fromcode);
+    }]])],
+    AC_MSG_RESULT(no), [AC_MSG_RESULT(yes);LIBS="$LIBS -liconv"])
+fi
+
+dnl placeholder
+AH_TEMPLATE(C_ICONV_WIN32,[Define to 1 to use Win32 functions in iconv backend])
+
+dnl If networking is used, add networking libraries last on Windows
+dnl so SDL_net, fluidsynth and libslirp successfully link to them
+if test x$enable_emscripten != xyes; then
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+       if test x$have_slirp = xyes; then
+         LIBS="$LIBS -luuid -lole32"
+       fi
+       LIBS="$LIBS -lwsock32 -lws2_32 -liphlpapi -lshlwapi"
+       if test x$enable_freetype = xyes; then
+         LIBS="$LIBS -lfreetype -lwinspool"
+       fi
+    ;;
+esac
+fi
+
+dnl LIBRARY USE: opencow
+case "$host" in
+    *-*-cygwin* | *-*-mingw32*)
+    if test x$enable_opencow = xyes; then
+      LIBS="-lopencow $LIBS -lstdc++ -lopencow" #need to put at the first, also better at the last too.
+      LDFLAGS="$LDFLAGS -Wl,--allow-multiple-definition "
+      if test -n "$SDL_LIBS"; then
+        LIBS="${LIBS//-luser32/-lopencow -luser32}"
+        #SDL_LIBS="${SDL_LIBS//-luser32/\-lopencow -luser32}"
+      fi
+    fi
+    ;;
+esac
+
+dnl BUILD: whether to enable universal binary support
+if test x"$macosx" = x"1" && test x"$host_cpu" = x"arm"; then
+  AC_ARG_ENABLE(universal,AC_HELP_STRING([--enable-universal],[Enable macOS universal binary support]),
+    [enable_universal=$enableval],
+    [enable_universal=no])
+else
+  enable_universal=no
+fi
+
+AM_CONDITIONAL(MACOS_UNIVERSAL, [ test x$enable_universal = xyes ])
+
+AC_CONFIG_FILES([ 
+Makefile
+src/Makefile
+src/cpu/Makefile
+src/cpu/core_full/Makefile
+src/cpu/core_normal/Makefile
+src/debug/Makefile
+src/dos/Makefile
+src/fpu/Makefile
+src/gamelink/Makefile
+src/gui/Makefile
+src/hardware/Makefile
+src/hardware/mame/Makefile
+src/hardware/serialport/Makefile
+src/hardware/reSID/Makefile
+src/hardware/parport/Makefile
+src/aviwriter/Makefile
+src/ints/Makefile
+src/libs/Makefile
+src/libs/zmbv/Makefile
+src/libs/gui_tk/Makefile
+src/libs/passthroughio/Makefile
+src/libs/mt32/Makefile
+src/libs/xBRZ/Makefile
+src/libs/fluidsynth/Makefile
+src/libs/decoders/internal/Makefile
+src/output/Makefile
+src/output/direct3d/Makefile
+src/builtin/Makefile
+src/misc/Makefile
+src/shell/Makefile
+src/platform/Makefile
+include/Makefile
+contrib/macos/dosbox-x.plist
+contrib/linux/dosbox-x.spec
+contrib/linux/com.dosbox_x.DOSBox-X.metainfo.xml
+make-rpm.sh
+])
+AC_OUTPUT
+
+# HACK: it's a script...
+chmod +x make-rpm.sh