When trying to install xorg-server, I get an error with GL:   configure: error: Package requirements (glproto >= 1.4.17 mesa-gl >= 9.2.0) were not met: Package 'mesa-gl', required by 'virtual:world', not found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables GL_CFLAGS and GL_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. !!!