Please do not add ebuilds that fetch from upstream SCM repositories; if upstream does not make release, create a tarball and push that to the mirrors or to dev.gentoo.org storage (until Infra comes up with something better). It really should _not_ be done this way because it removes checksum verification as well as disobeying --fetch commands.
I have taken this upstream. Let's see what we get... Issue 42: Requesting release tarballs for gprof2dot http://code.google.com/p/jrfonseca/issues/detail?id=42
No reply or action from upstream. Creating a snapshot myself now... + 21 Oct 2010; Sebastian Pipping <sping@gentoo.org> + gprof2dot-0_p20100216.ebuild: + Migrate from mercurial checkout to snapshot tarball (bug #337088) +
