[Bug fortran/91731] Configure error on building MPICH

[keroro.90 at hotmail dot it]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91731

keroro.90 at hotmail dot it changed:

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                 CC|                            |keroro.90 at hotmail dot it

--- Comment #8 from keroro.90 at hotmail dot it ---
Steve workaround also worked for me (Fedora 32 + MPICH).
I just had to replace setenv with export as follows:
export PATH="~/work/x/bin:$PATH"   
export FFLAGS="-w -fallow-argument-mismatch -O2"

Hope this helps.