Unfortunately I'm using paludis as a package manager, if it makes any difference. Anyway.
What do you mean about an old version of GLU? Is there a newer than virtual/glu-9.0? In that ebuild, there is a dependency for old mesa.
RDEPEND="|| ( media-libs/glu <media-libs/mesa-9 media-libs/opengl-apple )"
It seems that I have only media-libs/libsdl installed that depends on the virtual/glu package.
EDIT: actually, quite a many package requires the virtual/glu package when opengl use flag is enabled.
These for example:
app-office/libreoffice-4.0.4.2
kde-base/kinfocenter-4.10.5
media-libs/freeglut-2.8.0-r1