anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  +    vdiff = callPackage ({ elpaBuild, emacs, fetchurl, hydra, lib }: elpaBuild {
  +        pname = "vdiff";
  +        version = "0.2.3";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/vdiff-0.2.3.el";
  +          sha256 = "197wszzhm2kbfvvlg3f0dzfs3lf4536yq5fd67k2rycj421fr9qz";
  +        };
  +        packageRequires = [ emacs hydra ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/vdiff.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
       vlf = callPackage ({ elpaBuild, fetchurl, lib }: elpaBuild {
           pname = "vlf";
           version = "1.7";
  
positive.code:       }) {};
      load-relative = callPackage ({ elpaBuild, fetchurl, lib }: elpaBuild {
          pname = "load-relative";
          version = "1.2";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/load-relative-1.2.el";
            sha256 = "0vmfal05hznb10k2y3j9mychi9ra4hxcm6qf7j1r8aw9j7af6riw";
          };
          packageRequires = [];
          meta = {
  
negative.code:     other-frame-window = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
      elpaBuild {
          pname = "other-frame-window";
          version = "1.0.3";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/other-frame-window-1.0.3.el";
            sha256 = "0vq1zfsdnxdjvmb7lkjyax27kfv0rw0141rd5fjnl6ap9yjwpxkv";
          };
          packageRequires = [ emacs ];
          meta = {
  