xaos-3.1.3 compiles on x86 with gcc-3.4.4-r1, simply by renaming the xaos-3.1.1 ebuild. Changelog: http://cvs.sourceforge.net/viewcvs.py/xaos/XaoS/ChangeLog?rev=1.21&only_with_tag=HEAD&view=markup
In CVS, thanks for the hint.