remove redundant make.inc. file

.github/workflows/python_wheel_macos_arm64.yml

@@ -28,7 +28,7 @@ jobs:
 
     - name: Compile libfinufft
       run: |
-        cp make.inc.gh_macos_arm64_whl make.inc
+        cp make.inc.macosx_arm64 make.inc
         make lib
 
     - name: Build wheels

make.inc.macosx_arm64

@@ -9,7 +9,7 @@
 # (note that /usr/bin/g++,gcc are aliased to clang/LLVM, so CXX,CC unchanged)
 
 # compile flags for use with clang: (note absence of -march, etc)
-CFLAGS = -O3 -arch arm64
+CFLAGS = -O3 -arch arm64 -target arm64-apple-macos11
 
 # If you're getting warning messages of the form:
 #    ld: warning: object file (lib-static/libfinufft.a(finufft1d.o)) was built for
@@ -22,15 +22,20 @@ CFLAGS = -O3 -arch arm64
 CXX=clang++
 CC=clang
 
+# assuming libomp and fftw are installed through homebrew
+OMP_ROOT = $(shell brew --prefix libomp)
+FFTW_ROOT = $(shell brew --prefix fftw)
+
 # taken from makefile...
-CFLAGS   += -I include -I/usr/local/include -I/opt/homebrew/include -I/opt/homebrew/opt/libomp/include
+CFLAGS   += -I include -I/usr/local/include -I$(OMP_ROOT)/include -I$(FFTW_ROOT)/include
 FFLAGS   = $(CFLAGS)
 CXXFLAGS = $(CFLAGS)
-LIBS += -L/usr/local/lib -L/opt/homebrew/lib -L/opt/homebrew/opt/libomp/lib
+LIBS += -L/usr/local/lib -L$(OMP_ROOT)/lib -L$(FFTW_ROOT)/lib
+LDFLAGS += -arch arm64 -target arm64-apple-macos11
 
 # OpenMP with clang needs following...
 OMPFLAGS = -Xpreprocessor -fopenmp
-OMPLIBS = -L/usr/local/lib -L/opt/homebrew/lib -lomp
+OMPLIBS = -lomp
 # since fftw3_omp doesn't work in OSX, we need...
 FFTWOMPSUFFIX=threads