self: super: rec {
  libevhtp = super.callPackage ./libevhtp/default.nix {};
  libsearpc = super.callPackage ./libsearpc/default.nix {};
  seafile-server = super.callPackage ./seafile-server/default.nix { inherit libevhtp python27Packages libsearpc;};
  python27Packages = super.python27Packages // rec {
    django-jsonfield = super.python27Packages.callPackage ./django-jsonfield/default.nix {};
    jsonfield = super.python27Packages.callPackage ./jsonfield/default.nix {};
    django-post_office = super.python27Packages.callPackage ./django-post_office/default.nix { inherit jsonfield; };
  };
}