Hi, I'm trying to compile the following software using cmake: https://github.com/fabienbaron/bsmem But it fails when I run the make command and I get this message: [ 16%] Building C object src/CMakeFiles/bsmem.dir/bsmem.c.o In file included from /Users/youcef/Documents/bsmem-/src/bsmem.c:56: /Users/youcef/Documents/bsmem-/src/bsmem.h:135: warning: "M_PI" redefined   135 | #define M_PI 3.14159265358979323       |  In file included from /Users/youcef/Documents/bsmem-/src/bsmem.h:12,                  from /Users/youcef/Documents/bsmem-/src/bsmem.c:56: /opt/local/lib/gcc10/gcc/x86_64-apple-darwin19/10.1.0/include-fixed/math.h:707: note: this is the location of the previous definition   707 | #define M_PI        3.14159265358979323846264338327950288   /* pi             */       |  [ 33%] Building Fortran object src/CMakeFiles/bsmem.dir/bsmemf.f.o [ 50%] Building C object src/CMakeFiles/bsmem.dir/free_fits.c.o [ 66%] Building C object src/CMakeFiles/bsmem.dir/read_fits.c.o [ 83%] Building Fortran object src/CMakeFiles/bsmem.dir/vector.f.o [100%] Linking C executable ../../bin/bsmem Undefined symbols for architecture x86_64:   "_mecopy_", referenced from:       _icf_ in bsmemf.f.o       _tricf_ in bsmemf.f.o   "_meinit_", referenced from:       _bsmem in bsmem.c.o   "_mem4_", referenced from:       _bsmem in bsmem.c.o   "_memset_", referenced from:       _bsmem in bsmem.c.o   "_meswap_", referenced from:       _udiag_ in bsmemf.f.o   "_movie4_", referenced from:       _bsmem in bsmem.c.o ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status make[2]: * [../bin/bsmem] Error 1 make[1]: * [src/CMakeFiles/bsmem.dir/all] Error 2 code-block What is the best thing to do to make it build in x86_64 architecture? Any suggestion would be welcome. Thank you very much, Youcef.