If an user have ABI_X86="32" set on their system app-emulation/emul-linux-x86-baselibs-20130224-r13 requires sys-libs/gpm to be installed if if it is not so far. IMHO emul-linux-x86-baselibs could make use of "gpm" use flag ... [ebuild N ] sys-libs/gpm-1.20.7-r2 USE="(-selinux) -static-libs" ABI_X86="32 (64) (-x32)" 0 kB ... [ebuild U ] app-emulation/emul-linux-x86-baselibs-20130224-r13 [20130224-r12] USE="development" ABI_X86="32" 0 kB [blocks b ] <=app-emulation/emul-linux-x86-baselibs-20130224-r12 ("<=app-emulation/emul-linux-x86-baselibs-20130224-r12" is blocking sys-libs/gpm-1.20.7-r2, sys-libs/ncurses-5.9-r3, sys-libs/e2fsprogs-libs-1.42.7-r1)
baselibs is a compatibility package. For that reason, we need to install everything that was installed by the original package, even if you didn't have it in native ABI. The gpm install will become unnecessary once we get revdeps not to rely on emul-linux. That is the same amount of work as required to introduce USE=gpm, except for that it is not in vain.