anchor.diff:          packageRequires = [ seq ];
           meta = {
             homepage = "https://elpa.gnu.org/packages/beacon.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
  +    bnf-mode = callPackage ({ cl-lib ? null, elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "bnf-mode";
  +        ename = "bnf-mode";
  +        version = "0.4.2";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/bnf-mode-0.4.2.tar";
  +          sha256 = "04wl563hxgjbhz6hhwvysdfvdni9fm7kahy5wxkyqxi1sy64gn7d";
  +        };
  +        packageRequires = [ cl-lib emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/bnf-mode.html";
             license = lib.licenses.free;
           };
         }) {};
  
positive.code:       elpaBuild {
          pname = "ebdb";
          ename = "ebdb";
          version = "0.6.6";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/ebdb-0.6.6.tar";
            sha256 = "1jgx099z9xg47v698qjbk5q70bakfw7zxaj25z4jz1mq64fvk6b5";
          };
          packageRequires = [ cl-lib emacs seq ];
          meta = {
  
negative.code:       elpaBuild {
          pname = "debbugs";
          ename = "debbugs";
          version = "0.18";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/debbugs-0.18.tar";
            sha256 = "00kich80zdg7v3v613f9prqddkpwpm1nf9sj10f0n6wh15rzwv07";
          };
          packageRequires = [ cl-lib emacs soap-client ];
          meta = {
  