anchor.diff:  
       allowedRequisites =
         [ bootstrapTools ] ++
  -      (with pkgs; [ xz libcxx libcxxabi icu ]) ++
  +      (with pkgs; [ xz.bin xz.out libcxx libcxxabi icu.out ]) ++
         (with pkgs.darwin; [ dyld Libsystem CF locale ]);
   
       overrides = persistent1;
  
positive.code: 
      allowedRequisites =
        [ bootstrapTools ] ++
        (with pkgs; [ icu bash libcxx libcxxabi ]) ++
        (with pkgs.darwin; [ dyld Libsystem locale ]);
  
      overrides = persistent2;
  
negative.code:     };
  
      allowedRequisites = (with pkgs; [
        xz.out xz.bin libcxx libcxxabi icu.out gmp.out gnumake findutils bzip2.out
        bzip2.bin llvm zlib.out zlib.dev libffi.out coreutils ed diffutils gnutar
        gzip ncurses.out ncurses.dev ncurses.lib ncurses.man gnused bash gawk
        gnugrep llvmPackages.clang-unwrapped patch pcre.out binutils-raw.out
        binutils-raw.dev binutils gettext
      ]) ++ (with pkgs.darwin; [
        dyld Libsystem CF cctools libiconv locale
      ]);
  