anchor.diff:        statsd
         pyramid_zodbconn
         pyramid_mailer
  +      pyramid_chameleon
  +      ZEO
       ];
   
       meta = with stdenv.lib; {
  
positive.code:     propagatedBuildInputs = [
        pyramid
        pytz
        zodb3
        venusian
        colander
        deform
        deform_bootstrap
        python_magic
        pyyaml
        cryptacular
  
negative.code: 
  
    zodburi = buildPythonPackage rec {
      name = "zodburi-2.0";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/z/zodburi/${name}.tar.gz";
        md5 = "7876893829c2f784506c80d49f861b67";
      };
  
      buildInputs = [ zodb mock ZEO ];
  
      meta = {
        maintainers = [ stdenv.lib.maintainers.iElectric ];
      };
    };
    
    ZEO = pythonPackages.buildPythonPackage rec {
      name = "ZEO-4.0.0";
  
      propagatedBuildInputs = [ random2 zodb six transaction persistent zc_lockfile zconfig zdaemon zope_interface ];
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/Z/ZEO/${name}.tar.gz";
        md5 = "494d8320549185097ba4a6b6b76017d6";
      };
  
      meta = with stdenv.lib; {
        homepage = https://pypi.python.org/pypi/ZEO;
      };
    };
    
    random2 = pythonPackages.buildPythonPackage rec {
      name = "random2-1.0.1";
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/r/random2/${name}.zip";
        md5 = "48a0a86fe00e447212d0095de8cf3e21";
      };
    };
  
  
    substanced = buildPythonPackage rec {
      # no release yet
      rev = "089818bc61c3dc5eca023254e37a280b041ea8cc";
      name = "substanced-${rev}";
  
      src = fetchgit {
        inherit rev;
        url = "https://github.com/Pylons/substanced.git";
        sha256 = "17s7sdvydw9a9d2d36c70lq962ryny3dv9nzdxqpfvwiry9iy3jx";
      };
  
      buildInputs = [ mock ];
  