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