Comment # 51 on bug 1177260 from Egbert Eich

(In reply to Richard Biener from comment #50)
> Maybe you can just override LD?  OTOH to get libgfortran linked the link
> probably uses FC, not CC, or does it explicitely add -lgfortran?  To me it
> looks like an issue in the openblas makefiles.

It uses CC for linking - which points to gcc11 (on Leap/SLE) while FC which
points to the stock gfortran is used to build the fortran sources. The latter
may not be all that problematic, however, a binary may use other fortran
libraries built with the stock gfortran compiler or be built/linked itself
using this compiler.
And, yes, the final link (done with $CC) adds -lgfortran.
The problem is that we need to link C and Fortran objects together and make
sure, the right libgfortran is used. I will try what happens if I naively set
-lgfortran4. Likely, gcc11 will not find this library.