anchor.diff:           "ac_cv_func_posix_getgrgid_r=yes"
          ];
   
  -  doCheck = false; # fails
  +  enableParallelBuilding = true;
  +  doCheck = true;
   
     postInstall = ''rm -f "$out"/bin/*-pkg-config''; # clean the duplicate file
   
  
positive.code:     platforms = platforms.all;
      license = licenses.gpl2Plus;
    };
  
  }
  
negative.code: { stdenv, fetchurl, libiconv, vanilla ? false }:
  
  with stdenv.lib;
  
  stdenv.mkDerivation rec {
    pname = "pkg-config";
    version = "0.29.2";
  
    setupHook = ./setup-hook.sh;
  
    src = fetchurl {
      url = "https://pkgconfig.freedesktop.org/releases/${pname}-${version}.tar.gz";
      sha256 = "14fmwzki1rlz8bs2p810lk6jqdxsk966d8drgsjmi54cd00rrikg";
    };
  
    # Process Requires.private properly, see
    # http://bugs.freedesktop.org/show_bug.cgi?id=4738.
    patches = optional (!vanilla) ./requires-private.patch
      ++ optional stdenv.isCygwin ./2.36.3-not-win32.patch;
  
    # These three tests fail due to a (desired) behavior change from our ./requires-private.patch
    postPatch = ''
      rm -f check/check-requires-private check/check-gtk check/missing
    '';
  
    buildInputs = optional (stdenv.isCygwin || stdenv.isDarwin || stdenv.isSunOS) libiconv;
  
  