This package fails to build in mock if the minimal build group is reduced to only the packages listed in the Exceptions section of the packaging guidelines. build.log can be found at http://linux.dell.com/files/fedora/FixBuildRequires/mock-results-extras/i386/gnome-ppp-0.3.23-1.fc6.src.rpm/result/build.log BR intltool fixed it.
Fixed in gnome-ppp-0.3.23-2. Closing.