anchor.diff:    doInstallCheck = true;
     installCheckPhase = ''
       pushd ${src}
  -    $out/bin/cquery --ci --clang-sanity-check && \
       $out/bin/cquery --ci --test-unit
     '';
   
  
positive.code:   src = fetchFromGitHub {
      owner = "cquery-project";
      repo = "cquery";
      rev = "e45a9ebbb6d8bfaf8bf1a3135b6faa910afea37e";
      sha256 = "049gkqbamq4r2nz9yjcwq369zrmwrikzbhfza2x2vndqzaavq5yg";
      fetchSubmodules = true;
    };
  
  
negative.code: in
  stdenv.mkDerivation rec {
    name    = "cquery-${version}";
    version = "2018-05-01";
  
    inherit src;
  
  