anchor.diff:      ]);
   
       overrides = self: super:
  -      let persistent = persistent4 prevStage self super; in persistent // {
  +      let persistent' = persistent self super; in persistent' // {
           clang = cc;
  -        llvmPackages = persistent.llvmPackages // { clang = cc; };
  +        llvmPackages = persistent'.llvmPackages // { clang = cc; };
           inherit cc;
         };
     };
  
positive.code:       (with pkgs; [ xz.bin xz.out libcxx libcxxabi ]) ++
        (with pkgs.darwin; [ dyld Libsystem CF ICU locale ]);
  
      overrides = persistent1 prevStage;
    };
  
    persistent2 = prevStage: self: super: with prevStage; {
      inherit
        patchutils m4 scons flex perl bison unifdef unzip openssl python
        gettext sharutils libarchive pkg-config groff bash subversion
        openssh sqlite sed serf openldap db cyrus-sasl expat apr-util
        findfreetype libssh curl cmake autoconf automake libtool cpio
        libcxx libcxxabi;
  
      darwin = super.darwin // {
        inherit (darwin)
          dyld Libsystem xnu configd libdispatch libclosure launchd libiconv locale;
      };
    };
  
    stage3 = prevStage: with prevStage; stageFun 3 prevStage {
      shell = "${pkgs.bash}/bin/bash";
  
      # We have a valid shell here (this one has no bootstrap-tools runtime deps) so stageFun
  
negative.code:     extraBuildInputs = [];
    };
  
    stage1 = prevStage: let
      persistent = _: _: {};
    in with prevStage; stageFun 1 prevStage {
      extraPreHook = "export NIX_CFLAGS_COMPILE+=\" -F${bootstrapTools}/Library/Frameworks\"";
      extraBuildInputs = [ pkgs.libcxx ];
  
      allowedRequisites =
        [ bootstrapTools ] ++ (with pkgs; [ libcxx libcxxabi ]) ++ [ pkgs.darwin.Libsystem ];
  
      overrides = persistent;
    };
  
    stage2 = prevStage: let
      persistent = self: super: with prevStage; {
        inherit
          zlib patchutils m4 scons flex perl bison unifdef unzip openssl python
          libxml2 gettext sharutils gmp libarchive ncurses pkg-config libedit groff
          openssh sqlite sed serf openldap db cyrus-sasl expat apr-util subversion xz
          findfreetype libssh curl cmake autoconf automake libtool ed cpio coreutils;
  
        darwin = super.darwin // {
          inherit (darwin)
            dyld Libsystem xnu configd ICU libdispatch libclosure launchd;
        };
      };
    in with prevStage; stageFun 2 prevStage {
      extraPreHook = ''
        export PATH_LOCALE=${pkgs.darwin.locale}/share/locale
      '';
  