anchor.diff:    parallelInstall = false;
     parallelCheck = false;
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       description = "Programmable completion for the bash shell";
       homepage = "https://github.com/scop/bash-completion/";
       license = licenses.gpl2;
  
positive.code:   src = fetchurl {
      url = "https://github.com/scop/bash-completion/releases/download/"
        + "${version}/${name}.tar.xz";
      sha256 = "c0f76b5202fec9ef8ffba82f5605025ca003f27cfd7a85115f838ba5136890f6";
    };
  
    doCheck = true;
  
negative.code: { stdenv
  , fetchurl
  , lib
  }:
  
  let
    version = "2.5";
  in
  stdenv.mkDerivation rec {
    name = "bash-completion-${version}";
  