On virtualgl, it needs a variable set about the GL context set; freecad
suggests that upon failing to run in that environment.
svn path=/nixpkgs/trunk/; revision=26153
Either eigen changed the hash of the tarball, or I did not commit its latest hash.
I add boost 1.46 apart, because 1.44 does not work easily for freecad.
svn path=/nixpkgs/trunk/; revision=26151