In order to keep working on make the old quake binaries working, I have to compile some software with libc 5 (Mesa, svgalib, glide, ...) as the old quake binaries were compiled with libc5.
Even if there is some libc5 binaries around for those packages some are old (Mesa and Glide) and do not offer the features of today versions. As I stated earlier, Glide did not work with athlon, but the new version does.
So I repackaged George B. Moody, firstname.lastname@example.org, gcc5 package, adding a few corrections and put it here.
With it anyone can do a:
$ CC=gcc5 makeand compile an package with libc5 support out of the box.
It did worked with Glide_V2 and should work with anything that supports libc 5 and gcc-188.8.131.52.
I feel that I have to release it in freshmeat as many other people might be looking for something like this and not finding it.