Emerging networkmanager-pptp with USE=gtk currently pulls in gnome-keyring. I think this should be triggered by USE=gnome instead. In fact, the gtk useflag is mapped to a "--with-gnome" configure flag. Reproducible: Always
The "--without-gnome" configure flag removes the configuration gui. If we mapped USE=-gnome to "--without-gnome", it would make it impossible for users of non-gnome gtk-based desktops (e.g. xfce) who usually don't have USE=gnome in make.conf to configure their vpn. See bug #427406
Ok, I see. It's not a big deal anyway.