anchor.diff:  
     configureFlags = [
       "--disable-gp2ddb"
  -    "--enable-nls"
  -    "--enable-rpath"
  -    "--enable-largefile"
       "--disable-internal-docs"
       "--disable-docs"
       "--${boolWt (libjpeg-turbo != null)}-jpeg"
  
positive.code:   src = fetchurl {
      url = "mirror://sourceforge/gphoto/libgphoto/${version}/${name}.tar.bz2";
      hashOutput = false;
      sha256 = "e757416d1623e01a9d0d294b2e790162e434c0964f50d3b7ff1a3424b62a2906";
    };
  
    nativeBuildInputs = [
  
negative.code:   inherit (lib)
      boolWt;
  
    version = "2.5.17";
  in
  stdenv.mkDerivation rec {
    name = "libgphoto2-${version}";
  