Created attachment 319290 [details, diff] Make it possible to install gl.pc and osmesa.pc together. Reported on #gentoo-desktop IRC This makes x11-base/xorg-server fail to build against media-libs/mesa[osmesa]. Upstream ack'ed this patch but did not apply yet.
I can build xorg-server again if I "euse -D osmesa". So I can at least emerge again until this fix is in the tree.
osmesa flag is masked now for mesa-8.1_rc1_pre20120724
*** Bug 430330 has been marked as a duplicate of this bug. ***
mattst88 pointed out that this is fixed upstream since http://cgit.freedesktop.org/mesa/mesa/commit/?id=27013e5164a1823d5bdcb5ca21ae4ca0df40b8f8 A new snapshot will be rolled soon with fixes for this and some other issues.
Fixed in 8.1_rc1_pre20120814