anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  +    shell-command-plus = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "shell-command-plus";
  +        ename = "shell-command+";
  +        version = "2.3.2";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/shell-command+-2.3.2.tar";
  +          sha256 = "03hmk4gr9kjy3238n0ys9na00py035j9s0y8d87c45f5af6c6g2c";
  +        };
  +        packageRequires = [ emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/shell-command+.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
       shen-mode = callPackage ({ elpaBuild, fetchurl, lib }:
         elpaBuild {
           pname = "shen-mode";
  
positive.code:       elpaBuild {
          pname = "eldoc-eval";
          ename = "eldoc-eval";
          version = "0.1";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/eldoc-eval-0.1.el";
            sha256 = "1mnhxdsn9h43iq941yqmg92v3hbzwyg7acqfnz14q5g52bnagg19";
          };
          packageRequires = [];
          meta = {
  
negative.code:       elpaBuild {
          pname = "auctex";
          ename = "auctex";
          version = "13.0.16";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/auctex-13.0.16.tar";
            sha256 = "1r9piq4js45knw8sf73kk8jjinmx4m2mdinc98xrklnwcffw7hjf";
          };
          packageRequires = [ emacs ];
          meta = {
  