anchor.diff:        [ bootstrapTools ] ++
         (with pkgs; [
           xz.bin xz.out libcxx libcxxabi llvmPackages_7.compiler-rt
  -        llvmPackages_7.clang-unwrapped zlib libxml2.out curl.out openssl.out
  +        llvmPackages_7.clang-unwrapped zlib libxml2.out curl.out brotli.lib openssl.out
           libssh2.out nghttp2.lib libkrb5 coreutils gnugrep pcre.out gmp libiconv
         ]) ++
         (with pkgs.darwin; [ dyld Libsystem CF ICU locale ]);
  
positive.code:       [ bootstrapTools ] ++
        (with pkgs; [
          xz.bin xz.out bash libcxx libcxxabi llvmPackages_7.compiler-rt
          llvmPackages_7.clang-unwrapped zlib libxml2.out curl.out openssl.out
          libssh2.out nghttp2.lib libkrb5 coreutils gnugrep pcre.out gmp libiconv
        ]) ++
        (with pkgs.darwin; [ dyld ICU Libsystem locale ]);
  
negative.code:       gzip ncurses.out ncurses.dev ncurses.man gnused bash gawk
        gnugrep llvmPackages.clang-unwrapped llvmPackages.clang-unwrapped.lib patch pcre.out gettext
        binutils.bintools darwin.binutils darwin.binutils.bintools
        curl.out brotli.lib openssl.out libssh2.out nghttp2.lib libkrb5
        cc.expand-response-params libxml2.out
      ]) ++ (with pkgs.darwin; [
        dyld Libsystem CF cctools ICU libiconv locale libtapi
  