this enables the commands "bup meta" and "bup fuse".
why the git version? 0.24b (in nixpkgs) was broken. using 0.25rc1 gave the same error (gcc 4.6 related) Both these versions are over a year old and lots of commits were made after that, including something that fixed building on nix.
[1] https://github.com/apenwarr/bup Signed-off-by: David Guibert <david.guibert@gmail.com> svn path=/nixpkgs/trunk/; revision=28497