reiser4progs fails to compile with gcc4 http://marc.theaimsgroup.com/?l=reiserfs&m=110505649609121&w=2 patch found here
Created attachment 50582 [details, diff] reiser4progs-gcc4.patch patch to allow it to compile
Thanks for your report, this is in CVS. Please give the new ebuild two hours to propagate before syncing your portage tree.