anchor.diff:  
       # Create a derivation which encompasses everything, making buildInputs nicer
       mkdir -p $out/nix-support
  -    echo $dev >> $out/nix-support/propagated-build-inputs
  -    echo $lib >> $out/nix-support/propagated-build-inputs
  +    echo "$dev $lib" > $out/nix-support/propagated-native-build-inputs
     '';
   
     commonConfigureFlags = [
  +    "--includedir=$(dev)/include"
       "--libdir=$(lib)/lib"
     ];
   in
  
positive.code:     # We want to substitute the contents of configureFlags, removing thus the
      # usual --build and --host added on cross building.
      preConfigure = ''
        export configureFlags="--prefix=$dev --without-icu ${concatStringsSep " " commonConfigureFlags}"
        set -x
        cat << EOF > user-config.jam
        using gcc : cross : $crossConfig-g++ ;
  
negative.code:     url = "mirror://sourceforge/boost/boost_1_56_0.tar.bz2";
      sha256 = "07gz62nj767qzwqm3xjh11znpyph8gcii0cqhnx7wvismyn34iqk";
    };
  
    preConfigure = ''
      NIX_LDFLAGS="$(echo $NIX_LDFLAGS | sed "s,$out,$lib,g")"
    '';
  
    enableParallelBuilding = true;
  
  