anchor.diff:          packageRequires = [];
           meta = {
             homepage = "https://elpa.gnu.org/packages/shelisp.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
  +    shell-command-plus = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "shell-command-plus";
  +        ename = "shell-command+";
  +        version = "2.0.0";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/shell-command+-2.0.0.tar";
  +          sha256 = "1l8lwami4rbp94sbb1k4dvv7z0dvf51s0992xragpn9b9jbx5qd6";
  +        };
  +        packageRequires = [ emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/shell-command+.html";
             license = lib.licenses.free;
           };
         }) {};
  
positive.code:       elpaBuild {
          pname = "setup";
          ename = "setup";
          version = "0.1.1";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/setup-0.1.1.tar";
            sha256 = "0z34m06lxw6xd6bxacm1h5cijamsksk4daf6fbzhd7kqmw3gbgqg";
          };
          packageRequires = [ emacs ];
          meta = {
  
negative.code:       elpaBuild {
          pname = "auctex";
          ename = "auctex";
          version = "13.0.5";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/auctex-13.0.5.tar";
            sha256 = "072wwsqfl8n2gi2inbp0s8k1ydr6fh1zyvc3rgynwzibjjniy319";
          };
          packageRequires = [ cl-lib emacs ];
          meta = {
  