anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  +    scad-mode = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "scad-mode";
  +        ename = "scad-mode";
  +        version = "93.1";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/scad-mode-93.1.tar";
  +          sha256 = "0k9wqz2nd4j0wz2y300nn6rs8a9vpshnaa2hx6f8649k4y87bblp";
  +        };
  +        packageRequires = [ emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/scad-mode.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
       scala-mode = callPackage ({ elpaBuild, fetchurl, lib }:
         elpaBuild {
           pname = "scala-mode";
  
positive.code:       elpaBuild {
          pname = "sweeprolog";
          ename = "sweeprolog";
          version = "0.8.6";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/sweeprolog-0.8.6.tar";
            sha256 = "108hjh276xgl0xhn2f7h43725xi49zh6j2xrcc17xw2i0phhhswf";
          };
          packageRequires = [ emacs ];
          meta = {
  
negative.code:       elpaBuild {
          pname = "helm-core";
          ename = "helm-core";
          version = "3.9.0";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/helm-core-3.9.0.tar";
            sha256 = "1fvrxj64qc4976s6af2zc428dnx2p0skxdnkjikz8rpw8kmffcb9";
          };
          packageRequires = [ async emacs ];
          meta = {
  