anchor.diff:            license = lib.licenses.free;
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positive.code:       elpaBuild {
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          version = "20181230";
          src = fetchurl {
            url = "http://orgmode.org/elpa/org-plus-contrib-20181230.tar";
            sha256 = "0gibwcjlardjwq19bh0zzszv0dxxlml0rh5iikkcdynbgndk1aa1";
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          packageRequires = [];
          meta = {
  
negative.code:       elpaBuild {
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          ename = "org";
          version = "20190527";
          src = fetchurl {
            url = "http://orgmode.org/elpa/org-20190527.tar";
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