This part looks like where the error happens
rm if geometry.dir LD_LIBRARY_PATH=../../../exports/lib XLOCALEDIR=../../../exports/lib/locale ../../../exports/bin/xkbcom -lfhlpR -o geometry.dir 'o'
make: ***[geometry.dir] illegal instruction
First thing I would do is search the gentoo forums for "geometry.dir" and see what other people are doing to fix it. Normally when I'm following the guides I didn't do anything wrong and I search the forums to find that other people were having the exact same problems. If nothing turns up, wait a couple days if you can and update portage and try it again.
Here you go, this looks really good for you: http://forums.gentoo.org/search.php?...6f26033618a31b
ooops. The link won't go to the results page, so just search for geometry.dir on the gentoo forums. The first 3 results were xorg build problems and one said solved in the title.