This patches the Hydrogen scons build script to work a failure to parse the JACK version correctly. If I understand correctly upstream Hydrogen now uses cmake instead of Scons, so this shouldn't be a problem with the next Hydrogen release.
svn path=/nixpkgs/trunk/; revision=33516
svn path=/nixpkgs/trunk/; revision=33336
svn path=/nixpkgs/trunk/; revision=26866