anchor.diff:        name = "stdenv-darwin-boot-1";
   
         inherit system config;
  -      inherit (stage0.stdenv) shell initialPath fetchurlBoot;
  +      inherit (stage0.stdenv) shell fetchurlBoot;
  +
  +      initialPath = stage0.stdenv.initialPath ++ [ nativePrefix ];
   
         preHook = preHook + "\n" + ''
           export NIX_LDFLAGS_AFTER+=" -L/usr/lib"
  
positive.code:         cc           = {
            name    = "clang-9.9.9";
            cc      = "/usr";
            outPath = "${buildTools.tools}/Library/Developer/CommandLineTools/usr";
          };
        };
      };
  
negative.code:       nativeTools  = false;
        nativeLibc   = true;
        binutils  = pkgs.darwin.cctools;
        cc        = pkgs.llvmPackages.clang-unwrapped;
        coreutils = pkgs.coreutils;
        shell     = "${pkgs.bash}/bin/bash";
        extraPackages = [ pkgs.libcxx ];
  