anchor.diff:        ../development/python-modules/sqlalchemy-0.7.10-test-failures.patch
       ];
     });
  -
   
     sqlalchemy8 = pkgs.lib.overrideDerivation sqlalchemy9 (args: rec {
       name = "SQLAlchemy-0.8.7";
  
positive.code:     };
  
      buildInputs = [ pkgs.btrfsProgs ];
      propagatedBuildInputs = with pkgs; [ contextlib2 sqlalchemy8 pyxdg pycparser cffi alembic ];
  
      meta = {
        description = "Deduplication for Btrfs";
  
negative.code: 
    pydot = buildPythonPackage rec {
      name = "pydot-1.0.2";
      disabled = isPy3k;
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/p/pydot/${name}.tar.gz";
  