x11-drivers/ati-drivers 8.43.3 installs and works correctly for 64-bit applications, but fails to install a symlink on the 32-bit runtime library search path. This causes 32-bit apps to be unable to use OpenGL functionality. symlinking /usr/lib32/opengl/ati/lib/libGL.so.1 in /lib32 fixes the problem. Reproducible: Always
eselect opengl set ati The drivers package isn't supposed to make the symlink, eselect does. This allows for multiple opengl implementations on the same system. In your case, you'll already have two of them, xorg-x11 and ati.
OK. But then this bug is related to eselect and needs to remain open.
Nothing to fix here, kindly see Comment #1.