I have created a complete set of ebuilds for Gentoo. They will be submitted as part of ther portage tree (/usr/portage/dev-lang/{babel,chasm}, /usr/portage/sys-cluster{ccaffeine,ccafe-gui,cca-spec-babel}), no telling when/if they will be accepted. As usual, there are a number of issues and caveats for those who wish MPI and F90.
More info here.