NixOS/nixpkgs — pull request #765 by errge (2013-07-17 10:18:55+00:00)
Title: Use fetchgit for vanitygen instead of fetchurl, github changed something

Github changed something and the sha256 of the tar.gz for the same tag changed. :(

Probably it's better to only depend on git, so I changed the nix expression with fetchgit.