I'm trying to compile this code, but when running cmake .. in the build folder I get the messages:

-- Looking for Fortran sgemm -- Looking for Fortran sgemm - not found -- Looking for pthread.h -- Looking for pthread.h - found -- Performing Test CMAKE_HAVE_LIBC_PTHREAD -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success -- Found Threads: TRUE -- Looking for Fortran dgemm -- Looking for Fortran dgemm - found -- Found BLAS: /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Accelerate.framework -- Looking for Fortran cheev -- Looking for Fortran cheev - found -- A library with LAPACK API found.

showing that CMake was not able to find the sgemm LAPACK routine. This is strange because later, CMake says that it has found BLAS and LAPACK through Accelerate Framework.

My environment is:

CMake 3.17.0

macOS Catalina 10.15.4

and compilers are GNU GCC 9.3.0 installed via HomeBrew:

/usr/local/bin/gcc-9

/usr/local/bin/gfortran

I would appreciate it if you could help me know what is the problem and how I can solve it.

P.S. relevant discussion/code here, here, and here