anchor.diff:  
           libcxx = stdenv.mkDerivation {
             name = "bootstrap-stage0-libcxx";
  -          phases = [ "installPhase" "fixupPhase" ];
  +          dontUnpack = true;
             installPhase = ''
               mkdir -p $out/lib $out/include
               ln -s ${bootstrapTools}/lib/libc++.dylib $out/lib/libc++.dylib
  
positive.code:         '';
        };
  
        pbzx = stdenv.mkDerivation {
          name = "bootstrap-stage0-pbzx";
          phases = [ "installPhase" ];
          installPhase = ''
            mkdir -p $out/bin
            ln -s ${bootstrapTools}/bin/pbzx $out/bin
          '';
        };
  
        cpio = stdenv.mkDerivation {
          name = "bootstrap-stage0-cpio";
          phases = [ "installPhase" ];
          installPhase = ''
            mkdir -p $out/bin
            ln -s ${bootstrapFiles.cpio} $out/bin/cpio
          '';
        };
  
        darwin = super.darwin.overrideScope (selfDarwin: superDarwin: {
          darwin-stubs = superDarwin.darwin-stubs.override { inherit (self) stdenvNoCC fetchurl; };
  
negative.code: 
        doSign = localSystem.isAarch64 && last != null;
        doUpdateAutoTools = localSystem.isAarch64 && last != null;
        inherit (last.pkgs) runCommandLocal;
  
        mkExtraBuildCommands = cc: ''
          rsrc="$out/resource-root"
  