Idea by Eelco, initial patch by Jack Cummings, minor fixups by me svn path=/nixpkgs/branches/stdenv-updates/; revision=33741
Patch submitted by Jack Cummings <jack@mudshark.org> to the nix-dev mailing list in message <20120309092909.GG39859@ice9.mudshark.org>. svn path=/nixpkgs/branches/stdenv-updates/; revision=33536
svn path=/nixpkgs/branches/stdenv-updates/; revision=32373