A section of inline assembly code fails to compile in x86_specifics.c. The error is "can't find a register in GENERAL_REGS when reloading asm". I found a patch from Fedora that I have modified to work with my gentoo installation. I will attach it after the bug is filed.
Created attachment 73502 [details, diff] Patch file to make windowmaker compile with gcc-4.1
Upstream already has this patch as well.
Fixed, thanks.
...actually resolving the bug this time.... :)