Convert .c files to mex on macOS

I am trying to convert 6 files to the appropriate .mex file on a mac. The code has been done for windows and linux but I do not have access to either. I have gotten to elseif ismac and that is it. The last two are complied easily but the first four require the OpenMP - I have downloaded this and it is in the library. Is there any more downloads I need and how would the code look?

if ispc
    % windows platform, MSVC compiler
    mex COMPFLAGS="$COMPFLAGS /openmp"  -largeArrayDims -v count_subsets.cpp
    mex COMPFLAGS="$COMPFLAGS /openmp" -largeArrayDims -v is_subset.cpp
    mex COMPFLAGS="$COMPFLAGS /openmp"  -largeArrayDims -v adjacency_test_pattern_tree_C.cpp
    mex COMPFLAGS="$COMPFLAGS /openmp"  -largeArrayDims -v prune_candidates_rank_pattern_tree_C.cpp
    
    mex calculate_fraction.c        
    mex flush_file_cache.cpp
        
elseif isunix
    % unix platform, GCC compiler
    mex  CXXFLAGS="\$CXXFLAGS -fopenmp" LDFLAGS="\$LDFLAGS -fopenmp" -largeArrayDims -v count_subsets.cpp
    mex CXXFLAGS="\$CXXFLAGS -fopenmp" LDFLAGS="\$LDFLAGS -fopenmp" -largeArrayDims -v is_subset.cpp
    mex CXXFLAGS="\$CXXFLAGS -mpopcnt -fopenmp" LDFLAGS="\$LDFLAGS -mpopcnt -fopenmp" -largeArrayDims -v prune_candidates_rank_pattern_tree_C.cpp
    mex  CXXFLAGS="\$CXXFLAGS -fopenmp" LDFLAGS="\$LDFLAGS -fopenmp" -largeArrayDims -v adjacency_test_pattern_tree_C.cpp
    
    mex calculate_fraction.c
    mex flush_file_cache.cpp
    
elseif ismac
    % mac platform