Recently the ebuild was changed to try and drag in the old libstdc++ which I have banished from my system. The only binary that seems to require this is fireglcontrolpanel. Could you please add a USE flag to install this binary and pull in libstdc++ instead of unconditionally requiring it?
Run ldd on every library provided. ldd /usr/lib64/modules/dri/atiogl_a_dri.so libm.so.6 => /lib/libm.so.6 (0x00002aaaab4cb000) libstdc++.so.5 => /usr/lib/libstdc++-v3/libstdc++.so.5 (0x00002aaaab652000) libpthread.so.0 => /lib/libpthread.so.0 (0x00002aaaab82e000) librt.so.1 => /lib/librt.so.1 (0x00002aaaab943000) libGL.so.1 => //usr/lib64/opengl/ati/lib/libGL.so.1 (0x00002aaaaba4d000) libdl.so.2 => /lib/libdl.so.2 (0x00002aaaabc20000) libX11.so.6 => /usr/lib/libX11.so.6 (0x00002aaaabd23000) libXext.so.6 => /usr/lib/libXext.so.6 (0x00002aaaabf05000) libc.so.6 => /lib/libc.so.6 (0x00002aaaac016000) libgcc_s.so.1 => /usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/libgcc_s.so.1 (0x00002aaaac23b000) /lib64/ld-linux-x86-64.so.2 (0x0000555555554000) I'll ask for libstdc++ safe library upstream, but is unlikely to have them anytime soon.