anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  +    org-auto-tangle = callPackage ({ async, elpaBuild, emacs, fetchurl, lib }:
  +      elpaBuild {
  +        pname = "org-auto-tangle";
  +        ename = "org-auto-tangle";
  +        version = "0.4.1";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/org-auto-tangle-0.4.1.tar";
  +          sha256 = "169i1agnv66gkpgn5wxxri42610n2dp1gz9bfafk2n2a8b08mhn1";
  +        };
  +        packageRequires = [ async emacs ];
  +        meta = {
  +          homepage = "https://elpa.gnu.org/packages/org-auto-tangle.html";
  +          license = lib.licenses.free;
  +        };
  +      }) {};
       org-contrib = callPackage ({ elpaBuild, emacs, fetchurl, lib, org }:
         elpaBuild {
           pname = "org-contrib";
           ename = "org-contrib";
  -        version = "0.3";
  -        src = fetchurl {
  -          url = "https://elpa.nongnu.org/nongnu/org-contrib-0.3.tar";
  -          sha256 = "0fqhyby7624drskfsasgvzyxbgjb42rd6vw8l6xgb3h22kaprl0q";
  +        version = "0.4";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/org-contrib-0.4.tar";
  +          sha256 = "05r7w0h9v1vfhv1dd2vaabq2gm8ra70s1cirlp75s343b0z28ca6";
           };
           packageRequires = [ emacs org ];
           meta = {
  
positive.code:       elpaBuild {
          pname = "visual-fill-column";
          ename = "visual-fill-column";
          version = "2.4";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/visual-fill-column-2.4.tar";
            sha256 = "0100v17s9w9nqjpr7h3zianfy1i4i71idk2qrlzqzcd8qn1m3vjx";
          };
          packageRequires = [ emacs ];
          meta = {
  
negative.code:           license = lib.licenses.free;
          };
        }) {};
      evil-matchit = callPackage ({ elpaBuild, emacs, fetchurl, lib }:
        elpaBuild {
          pname = "evil-matchit";
          ename = "evil-matchit";
          version = "3.0.0";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/evil-matchit-3.0.0.tar";
            sha256 = "036zf7l8pkhbyk7gz91r00v4fqi2wfdnqv95xkh7jpm2i9xcgg5p";
          };
          packageRequires = [ emacs ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/evil-matchit.html";
            license = lib.licenses.free;
  