Org-mode head for emacsWithPackages

  org = mkDerivation rec {
      name = "emacs-org-${version}";
      version = "20180421";
      src = fetchgit {
        url = "https://code.orgmode.org/bzg/org-mode.git";
        rev = "02e290d1d497abf56427c9d7e92d639fa11e223a";
        sha256 = "1yz1w79bxf1c94p60ksxali2q2kz854gbzsvwqpax3vw8zz5kkx1";
        fetchSubmodules = true;
        leaveDotGit = true;
        deepClone = true;
        #date = "2018-04-21T15:22:53+02:00";
      };

      preBuild = ''
        makeFlagsArray=(
          prefix="$out/share"
          lispdir="$out/share/emacs/site-lisp"
          ORG_ADD_CONTRIB="org* ox*"
        );
      '';

      preInstall = ''
        perl -i -pe "s%/usr/share%$out%;" local.mk
      '';

      buildInputs = [ emacs ] ++ (with pkgs; [ texinfo perl which git ]);

      meta = {
        homepage = "https://elpa.gnu.org/packages/org.html";
        license = lib.licenses.free;
      };