anchor.diff:            license = lib.licenses.free;
           };
         }) {};
  -    websocket = callPackage ({ elpaBuild, fetchurl, lib }: elpaBuild {
  +    websocket = callPackage ({ cl-lib ? null, elpaBuild, fetchurl, lib }:
  +    elpaBuild {
           pname = "websocket";
           version = "1.8";
           src = fetchurl {
             url = "https://elpa.gnu.org/packages/websocket-1.8.tar";
             sha256 = "0dcxmnnm8z7cvsc7nkb822a1g6w03klp7cijjnfq0pz84p3w9cd9";
           };
  -        packageRequires = [];
  +        packageRequires = [ cl-lib ];
           meta = {
             homepage = "https://elpa.gnu.org/packages/websocket.html";
             license = lib.licenses.free;
  
positive.code:     metar = callPackage ({ cl-lib ? null, elpaBuild, fetchurl, lib }:
      elpaBuild {
          pname = "metar";
          version = "0.2";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/metar-0.2.el";
            sha256 = "0rfzq79llh6ixw02kjpn8s2shxrabvfvsq48pagwak1jl2s0askf";
          };
          packageRequires = [ cl-lib ];
          meta = {
  
negative.code:     soap-client = callPackage ({ cl-lib ? null, elpaBuild, fetchurl, lib }:
      elpaBuild {
          pname = "soap-client";
          version = "3.1.3";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/soap-client-3.1.3.tar";
            sha256 = "1s5m6dc7z532wchdih2ax2a791khyajjxb2xaw5rklk47yc5v3nk";
          };
          packageRequires = [ cl-lib ];
          meta = {
  