anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  +    popon = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "popon";
  +        ename = "popon";
  +        version = "0.4";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/popon-0.4.tar";
  +          sha256 = "1c3brjhkdnpawi8jsc20jvhc1vl3l39da12rn3lfx2bfxvjvz76w";
  +        };
  +        packageRequires = [ emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/popon.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
       popup = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
         elpaBuild {
           pname = "popup";
  
positive.code:       elpaBuild {
          pname = "cider";
          ename = "cider";
          version = "1.4.0";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/cider-1.4.0.tar";
            sha256 = "11a3ysvrywp79pp1yivpsgi8azgzbg7ayiai94p1dyd3viy29qn0";
          };
          packageRequires = [
            clojure-mode
  
negative.code:       elpaBuild {
          pname = "xah-fly-keys";
          ename = "xah-fly-keys";
          version = "17.13.20220526011611";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/xah-fly-keys-17.13.20220526011611.tar";
            sha256 = "1lg8805s5y61jr6yrm44zdjm0nad6adc5xr78zm0i0qzigbhhdcq";
          };
          packageRequires = [ emacs ];
          meta = {
  