Rawhide has been released after Sage 9.4, no wonder it is not supported.
There are still problems with gcc 11 support by Sage, see
https://trac.sagemath.org/ticket/31786
If you just want running Sage 9.3, probably conda is the easiest solution.
https://doc.sagemath.org/html/en/installation/conda.h
The most relevant part of the log file (attached) is this:
libtool: link: ranlib .libs/libquadmath.a
libtool: link: ( cd ".libs" && rm -f "libquadmath.la" && ln -s
"../libquadmath.la" "libquadmath.la" )
make[4]: *** [Makefile:995: all] Error 2
*
