polkit-0.93 depends on GInitableIface which is only provided with newer versions of glib. The only version of glib in portage to provide that interface is glib-2.21.4. I've attached the failed build log and environment. I've also tested that the polkit-0.93 build passes with glib-2.21.4. Reproducible: Always Steps to Reproduce:
Created attachment 199286 [details] Build log when building sys-auth/polkit-0.93 with dev-libs/glib-2.20.4
Created attachment 199287 [details] Environment when building sys-auth/polkit-0.93 with dev-libs/glib-2.20.4
ACK
mhh effectivelly, I can confirm http://library.gnome.org/devel/gio/unstable/GInitable.html#GInitableIface And the configure.ac is not up-to-date at all... upstream mistake... : PKG_CHECK_MODULES(GLIB, [glib-2.0 >= 2.14.0 gio-2.0 >= 2.14.0]) Okay this evening I'll write a patch to fix it (trivial fix) or if someone write one before no problem, feel free to do it :)
Fixed into the overlay without a bump. thanks for reporting ;)