app-emulation/emul-linux-x86-xlibs-7.0-r1 specifies an incorrect RDEPEND string (no parenthesis' around a useflag based depend atom). Patch supplied...
Created attachment 83891 [details, diff] patch for incorrect rdepend string
Fixed in CVS, thanks for pointing this out. Have you ever considered becoming an arch tester? It's a great way to help out with the project, have a look here for more information: http://www.gentoo.org/proj/en/base/amd64/tests/