https://bugs.freedesktop.org/show_bug.cgi?id=103968
--- Comment #5 from Michel Dänzer michel@daenzer.net --- (In reply to Odo Wolbers from comment #4)
ldd /usr/lib/xorg/modules/libglamoregl.so [...] libgbm.so.1 => /usr/local/lib/libgbm.so.1 (0x00007f4d676cd000) [...] libdrm.so.2 => /usr/local/lib/libdrm.so.2 (0x00007f4d65e5a000)
Does removing /usr/local/lib/libgbm.so* and /usr/local/lib/libdrm.so* help? If not, look for more leftovers under /usr/local/.