I forgot to mention: I use the classic shader compiler at the moment and I have
egl, gles1, gles2, vdpau and wayland enabled.

Full flags on portage:
[ebuild   R   #] media-libs/mesa-9999::x11  USE="egl gallium gles1 gles2 llvm
nptl shared-glapi vdpau wayland -abiwrapper -bindist -classic -debug -gbm
-opencl -openvg -osmesa -pax_kernel -pic -r600-llvm-compiler (-selinux) -xa
-xorg -xvmc" MULTILIB_ABI="amd64 x86" PYTHON_SINGLE_TARGET="python2_7
-python2_6" PYTHON_TARGETS="python2_7 -python2_6" VIDEO_CARDS="r600
(-freedreno) -i915 -i965 -ilo -intel -nouveau -r100 -r200 -r300 -radeon
-radeonsi -vmware"