anchor.diff:      };
   
       buildInputs = [ pkgs.btrfsProgs ];
  -    propagatedBuildInputs = with pkgs; [ contextlib2 sqlalchemy8 pyxdg pycparser cffi alembic ];
  +    propagatedBuildInputs = with pkgs; [ contextlib2 sqlalchemy9 pyxdg pycparser cffi alembic ];
   
       meta = {
         description = "Deduplication for Btrfs";
  
positive.code:       ../development/python-modules/sqlalchemy-0.7.10-test-failures.patch
      ];
    });
  
  
    sqlalchemy8 = pkgs.lib.overrideDerivation sqlalchemy9 (args: rec {
      name = "SQLAlchemy-0.8.7";
  
negative.code:   };
  
    sympy = buildPythonPackage rec {
      name = "sympy-0.7.4";
  
      src = fetchurl {
        url    = "https://github.com/sympy/sympy/releases/download/${name}/${name}.tar.gz";
        sha256 = "0h1b9mx0snyyybj1x1ga69qssgjzkkgx2rw6nddjhyz1fknf8ywh";
      };
      
      preCheck = ''
        export LANG="en_US.UTF-8"
        export LOCALE_ARCHIVE=${pkgs.glibcLocales}/lib/locale/locale-archive
      '';
  
      meta = with stdenv.lib; {
        description = "A Python library for symbolic mathematics";
  