Just an idea I had sometime ago, perhaps some bored developer sees it and might want to make it a reality.
It would be quite interesting if such a compiling/packaging system could be made. You compile with whatever flags you want and whatnot just like Gentoo's emerge, then it is converted into a package like apt-build or checkinstall (if emerge doesn't do that already), and then this package is seeded in a community-built meta-repository with many alternatives (somewhat like Arch's...