Refuse to build without a C++11 compiler

We had a buggy version of the AX_CXX_COMPILE_STDCXX macro: it didn't abort the build if no suitable compiler was found. Upgrade to the current version. Relevant on OpenBSD, where the default compiler does not support C++11.
pdewacht · Mar 2, 2016 · 03bb366 · 03bb366
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commit 03bb366
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diff --git a/configure.ac b/configure.ac
@@ -29,7 +29,7 @@ AM_MAINTAINER_MODE([enable])
 AM_SILENT_RULES([yes])
 
 AC_PROG_CXX
-AX_CXX_COMPILE_STDCXX_11
+AX_CXX_COMPILE_STDCXX([11])
 AX_CXXFLAGS_WARN_ALL
 
 dnl Use cups-config to detect the CUPS configuration.