The ticket https://trac.sagemath.org/ticket/27016 has been sitting for
several weeks in needs_review status, which is not all that unusual
and normally I wouldn't care.  However, people trying to build Sage
for the first time on Linux keep getting bitten by this irritating
gfortran issue.

They can avoid it by ensuring that a gfortran is *correctly* installed
on their system, though personally I don't care if they wind up
(unnecessarily) building the gfortran SPKG either so long as it works.

If the diff looks daunting, it really isn't.  As I have explained
multiple times on the ticket, it is mostly just refactoring of
existing scripts:  The spkg-install scripts for the gcc and gfortran
packages were nearly identical, so I just merged them into one that
could be reused.

I then added a patch, which comes from Debian, to prevent gcc from
installing libraries into some lib64/ directory, which we don't want
in Sage.

That's all it does, and I have tested it on multiple platforms myself
including macOS.

Thanks,
E

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