anchor.diff:        elpaBuild {
           pname = "popon";
           ename = "popon";
  -        version = "0.11";
  -        src = fetchurl {
  -          url = "https://elpa.nongnu.org/nongnu/popon-0.11.tar";
  -          sha256 = "03xxh9w215kmlw6vr3cjs9afkj6vrcip7k954sssx77bs1bpnqhz";
  +        version = "0.12";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/popon-0.12.tar";
  +          sha256 = "06vsri7dka3qbiwfkl4ml8b99alah24zq8y4n1szh587xy3c7dj0";
           };
           packageRequires = [ emacs ];
           meta = {
  
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:           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";
  