fatal error: 'omp.h' file not found on mac

I'm attempting to run the following using a macbook pro 32 bit Sequoia 15.6.1 with Xcode 16:

https://github.com/russellemarki/TextureReduction/tree/main/build_mex.m

But I keep getting the error:

>> build_mex
Building with 'Xcode Clang++'.
Error using mex
In file included from
/Users/user/Desktop/Novelis_project/Data/TextureReduction/calcGSH.cpp:16:
/Users/user/Desktop/Novelis_project/Data/TextureReduction/GSHFun.h:2:10:
fatal error: 'omp.h' file not found
    2 | #include <omp.h>
      |          ^~~~~~~
1 error generated.


Error in build_mex (line 3)
mex COMPFLAGS="$COMPFLAGS /openmp" calcGSH.cpp GSHFun.cpp GSHLibrarySmol.cpp -lmwblas
 

[Torsten]

Check

https://stackoverflow.com/questions/25990296/how-to-include-omp-h-in-os-x

https://mac.r-project.org/openmp/

https://uk.mathworks.com/help/coder/ug/install-openmp-library-on-macos-platform.html

if it helps.

Maybe you only have to include the path where OpenMP is located on your computer as compiler flag:

-L/usr/local/opt/libomp/lib -I/usr/local/opt/libomp/include

Or is it installed somewhere else on your mac ?