OSX doesn't support feenableexcept and fedisableexcept.

building error on Mac OS X. both feenableexcept and fedisableexcept is not support on OS X 10.14

I edit the code and define OSX in environment.

#ifudef OSX
  feenableexcept(FE_INVALID)
#endif

It works. I thought it is not important "feenableexcept fedisableexcept". Is it correct?

error message

/Users/chenxu/software/corsika/corsika8/build/include/corsika/process/sibyll/Decay.h:172:9: error:
      use of undeclared identifier 'feenableexcept'; did you mean
      'feraiseexcept'?
        feenableexcept(FE_INVALID);
        ^~~~~~~~~~~~~~
        feraiseexcept
/usr/include/fenv.h:299:12: note: 'feraiseexcept' declared here
extern int feraiseexcept(int /* excepts */);

the same with fedisableexcept