virtual/pkgconfig-1 switches the default provider to dev-util/pkgconf, which is a lighter dependency than dev-util/pkgconfig (which uses glib). At least Arch and Fedora use dev-util/pkgconf instead of dev-util/pkgconfig. Stabilizing virtual/pkgconfig-1 will mean that the stage3 tarballs are about 4~5 MB smaller. Please stabilize (I stabilized some architectures a few days ago and confirmed that stage building continues happily only now with dev-util/pkgconf)
Might want to do bug 677240 at the same time, if your architecture hasn't already.
sparc stable
amd64 stable
x86 stable
arm stable
s390 stable