Perhaps gnome-base/libgnome (or whatever gnome-libs version 2.x equivalents are) should be added?
*** Bug 155499 has been marked as a duplicate of this bug. ***
Especially now that Gnome 1.X is masked.
*** Bug 155503 has been marked as a duplicate of this bug. ***
17 Nov 2006; Saleem Abdulrasool <compnerd@gentoo.org> unixODBC-2.2.6.ebuild, unixODBC-2.2.6-r1.ebuild, unixODBC-2.2.8.ebuild, unixODBC-2.2.11.ebuild, unixODBC-2.2.11-r1.ebuild: Dropping gnome useflag for gnome-1.x removal