hash@canterlot ~/steam $ eix mesa
[I] app-eselect/eselect-mesa
     Available versions:  0.0.10
     Installed versions:  0.0.10(09:57:09 PM 03/04/2016)
     Homepage:            https://www.gentoo.org/
     Description:         Utility to change the Mesa OpenGL driver being used

[I] media-libs/mesa
     Available versions:  [M]7.10.3 10.3.7-r1^d 11.0.6^d ~11.0.8^d ~11.0.9^d ~11.1.2-r1^d **9999^d {bindist +classic d3d9 debug +dri3 +egl +gallium +gbm gles gles1 gles2 hardened (+)llvm motif +nptl opencl openmax openvg osmesa pax_kernel pic selinux +udev vaapi vdpau wayland xa xvmc ABI_MIPS="n32 n64 o32" ABI_PPC="32 64" ABI_S390="32 64" ABI_X86="32 64 x32" KERNEL="FreeBSD linux" VIDEO_CARDS="freedreno i915 i965 ilo intel mach64 mga nouveau r100 r128 r200 r300 r600 radeon radeonsi savage sis tdfx via vmware"}
     Installed versions:  11.0.6(01:15:08 PM 03/06/2016)(bindist classic d3d9 dri3 egl gallium gbm gles1 gles2 llvm nptl opencl osmesa udev vaapi vdpau -debug -openmax -pax_kernel -pic -selinux -wayland -xa -xvmc ABI_MIPS="-n32 -n64 -o32" ABI_PPC="-32 -64" ABI_S390="-32 -64" ABI_X86="32 64 -x32" KERNEL="-FreeBSD" VIDEO_CARDS="i915 intel -freedreno -i965 -ilo -nouveau -r100 -r200 -r300 -r600 -radeon -radeonsi -vmware")
     Homepage:            http://mesa3d.sourceforge.net/
     Description:         OpenGL-like graphic library for Linux

[I] x11-apps/mesa-progs
     Available versions:  8.2.0 ~8.3.0 **9999 {egl gles2}
     Installed versions:  8.2.0(01:24:54 PM 03/06/2016)(egl -gles2)
     Homepage:            http://mesa3d.sourceforge.net/
     Description:         Mesa's OpenGL utility and demo programs (glxgears and glxinfo)