anchor.diff:  
   
     alot = buildPythonPackage rec {
  -    rev = "0.3.6";
  -    name = "alot-0.3.6";
  -
  -    src = pkgs.fetchurl {
  -      url = "https://github.com/pazz/alot/tarball/${rev}";
  -      name = "${name}.tar.bz";
  -      sha256 = "1rzy70w4isvypa94310xw403vq5him21q8rlx4laa0z530phkrmq";
  -    };
  -
  -    # error: invalid command 'test'
  -    doCheck = false;
  +    rev = "0.3.7";
  +    name = "alot-${rev}";
  +
  +    src = pkgs.fetchFromGitHub {
  +      owner = "pazz";
  +      repo = "alot";
  +      inherit rev;
  +      sha256 = "0sscmmf42gsrjbisi6wm01alzlnq6wqhpwkm8pc557075jfg19il";
  +    };
  +
  +    postPatch = ''
  +      substituteInPlace alot/defaults/alot.rc.spec \
  +        --replace "themes_dir = string(default=None)" \
  +                  "themes_dir = string(default='$out/share/themes')"
  +    '';
   
       propagatedBuildInputs =
         [ self.notmuch
           self.urwid
  +        self.urwidtrees
           self.twisted
  -        self.magic
  +        self.python_magic
           self.configobj
           self.pygpgme
         ];
   
       postInstall = ''
  +      mkdir -p $out/share
  +      cp -r extra/themes $out/share
         wrapProgram $out/bin/alot \
           --prefix LD_LIBRARY_PATH : ${pkgs.notmuch}/lib:${pkgs.file}/lib:${pkgs.gpgme}/lib
       '';
  
positive.code:     meta = {
        homepage = https://github.com/pazz/alot;
        description = "Terminal MUA using notmuch mail";
        maintainers = with maintainers; [ garbas ];
      };
    };
  
  
negative.code:       maintainers = with maintainers; [ garbas ];
      };
    });
  
    urwidtrees = buildPythonPackage rec {
      name = "urwidtrees-${rev}";
      rev = "1.0";
  
      src = pkgs.fetchFromGitHub {
        owner = "pazz";
        repo = "urwidtrees";
        inherit rev;
        sha256 = "03gpcdi45z2idy1fd9zv8v9naivmpfx65hshm8r984k9wklv1dsa";
      };
  
      propagatedBuildInputs = with self; [ urwid ];
  
      meta = {
        description = "Tree widgets for urwid";
        license = licenses.gpl3;
        maintainer = with maintainters; [ profpatsch ];
      };
    };
  
    pyuv = buildPythonPackage rec {
      name = "pyuv-0.11.5";
  