As reported in https://groups.google.com/g/sage-devel/c/81unMG60MyU/m/JdMKMFOSBQAJ

Workaround: export CFLAGS="${CFLAGS} -Wno-error=return-type" (https://groups.google.com/g/sage-devel/c/81unMG60MyU/m/TfBT8KOsBQAJ)

This is caused by strict compiler flags leaking from the opensuse python3 package into user packages via sysconfig/distutils.
Same mechanism as the failures with misconfigured python3 in #31132 (homebrew), #33078 (cygwin), #32531 (pyenv)

Upstream issue:

• https://bugzilla.opensuse.org/show_bug.cgi?id=1194605

Upstream: Reported upstream. No feedback yet.

CC: @dimpase @orlitzky

Component: build

Author: Matthias Koeppe

Branch: fa2e672

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/33153