Staring build masa-10.4 with +radeon VIDEOCARD flag stops with error: configure: error: LLVM 3.3 or newer is required for r600g and radeonsi But ebuild does not contain this dependency, it queries only LLVM-2.9. Sory for my English.
On a unrelated note, I've bumped the dep to 3.3-r3 in -9999.
I know this bug is old and newer versions of Mesa are stable by now, but I went ahead and fixed the 10.0.4 ebuild. Thanks!