Build Error on mac M series

[pedrozarin2024]

after i build opencv and ncnn i got this error:

-- Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
-- Could NOT find OpenMP_CXX (missing: OpenMP_CXX_FLAGS OpenMP_CXX_LIB_NAMES)
-- Could NOT find OpenMP (missing: OpenMP_C_FOUND OpenMP_CXX_FOUND)
-- Configuring done (0.6s)
-- Generating done (0.0s)
-- Build files have been written to: /Users/alireza/Work/CPP/LET-NET-main/build
[ 33%] Linking CXX executable demo
clang: error: unsupported option '-fopenmp'
make[2]: *** [demo] Error 1
make[1]: *** [CMakeFiles/demo.dir/all] Error 2
make: *** [all] Error 2

can any one help me

[linyicheng1]

Try to install openMP