I haven't fully tested this yet, but you can also try installing gcc-10 through homebrew and then using gfortran-10. Here are the steps to try:
> brew install gcc-10 and then once in a clean sage directory (so run make distclean if you need to): > source .homebrew-build-env > make configure > FC=gfortran-10 ./configure > make will force the configure script to use gfortran 10. At the time of posting this I did check that this does allow numpy to build. On Monday, May 10, 2021 at 3:01:56 PM UTC-4 Matthias Koeppe wrote: > Our configure script rejects the current gfortran from homebrew - which is > already 11.1. > > This leads to building gfortran from source, an old version which does not > support Big Sur. > Try with https://trac.sagemath.org/ticket/29703 please (use ./bootstrap), > which upgrades our gcc/gfortran package. > > > > On Monday, May 10, 2021 at 11:46:50 AM UTC-7 modp...@gmail.com wrote: > >> I'm trying to build SageMath 9.3 from source on MacOS Big Sur 11.3.1. >> >> It fails with the following: >> >> v = self.gnu_version_match(version_string) >> >> File >> "/Users/myUser/app/sage-9.3/local/var/tmp/sage/build/numpy-1.19.5/src/numpy/distutils/fcompiler/gnu.py", >> >> line 80, in gnu_version_match >> >> raise ValueError(err + version_string) >> >> ValueError: A valid Fortran version was not found in this string: >> >> >> 9.2.0 >> >> >> ******************************************************************************** >> >> Error building a wheel for numpy-1.19.5 >> >> >> ******************************************************************************** >> >> >> Please find the log files attached. Any ideas what the issue might be? >> > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/a38ef63a-355b-4bfe-ac53-c2645c34490bn%40googlegroups.com.
