anchor.diff: -{ lib, stdenv
  +{ stdenv
  +, lib
   , fetchurl
  +, fetchpatch
   , meson
   , ninja
   , pkg-config
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "babl";
    version = "0.1.88";
  
    outputs = [ "out" "dev" ];
  
    src = fetchurl {
      url = "https://download.gimp.org/pub/babl/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "sha256-Tw1/SqoLsucl80mt97NRqVfZ+ybVVdmJWnr4FrQWcDk=";
    };
  
    nativeBuildInputs = [
  
negative.code:   meta = with lib; {
      description = "Image pixel format conversion library";
      homepage = "https://gegl.org/babl/";
      changelog = "https://gitlab.gnome.org/GNOME/babl/-/blob/BABL_${lib.replaceStrings [ "." ] [ "_" ] version}/NEWS";
      license = licenses.lgpl3Plus;
      maintainers = with maintainers; [ jtojnar ];
      platforms = platforms.unix;
  