About sage-mathematics: It includes lots of libraries like lapack as well within the tarball, and the default installation procedure tries to build from its own lapack instead of using the system lapack.
Building sage-mathematics would require us to properly identify the core components of sage which are not packaged separately (that's how it's being packaged for Debian [1] [2]): [1]: http://wiki.sagemath.org/DebianSAGE [2]: http://groups.google.com/group/debian-sage -- Abhishek Dasgupta
