Hi all,

I was looking into the Koschei-reported failure of the arpack package on
F44 (https://koschei.fedoraproject.org/package/arpack?collection=f44), and
it seems to have started failing immediately after the GCC update landed in
rawhide.

The thing I can't understand is the failure is actually in a configure
check for a header. It uses the eigen3 library (so installs eigen3-devel),
and the configure check for that library has passed, but the subsequent
check for the actual "Eigen/Sparse" header fails. The tests it does are
standard autoconf macros (
https://github.com/opencollab/arpack-ng/blob/f73592dd1e5e39c469ade3587db76794ddfa171d/configure.ac#L92),
so I am perplexed why it seems this GCC update being merged has caused them
to start failing when the eigen3 package hasn't changed at all.

I am not that experienced with autoconf, so does anyone have any thoughts
on what might be causing this?

Thanks,
-Ian
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