This use flag still isn't used in the glibc ebuild. If it is somehow used it's definitely undocumented what it means for this package. Reproducible: Always Steps to Reproduce: This is a deliberate dupe of bug 203856 since I can't reopen that and numerous comments requesting it be reopened have been ignored.
Are you *sure*? If media-libs/gd is installed -> USE="gd" should build a application of somesort with glibc. It's not in depends list on purpose.
Looks used to me: /usr/portage/sys-libs/glibc $ grep -r use_with * files/eblits/src_compile.eblit: $(use_with gd) files/eblits/src_compile-2.11.2.eblit: $(use_with gd)
* Configuring GLIBC for nptl /var/tmp/portage/sys-libs/glibc-2.12.1-r1/work/glibc-2.12.1/configure --disable-stackguard-randomization --enable-old-ssp-compat --enable-add-ons=nptl,c_stubs,libidn --enable-kernel=2.6.9 --without-selinux --without-cvs --enable-bind-now --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --disable-profile --without-gd ^^^^^^^^^^^^ Used. *** This bug has been marked as a duplicate of bug 203856 ***