anchor.diff:  done
     '';
   
  -  xcrun = writeText "xcrun" ''
  -#!${runtimeShell}
  +  xcrun = writeShellScriptBin "xcrun" ''
   while [ $# -gt 0 ]; do
      case "$1" in
            --sdk | -sdk) shift ;;
  
positive.code:   propagatedBuildInputs = [ "${toolchains}/XcodeDefault.xctoolchain" ];
  
    passthru = {
      inherit xcbuild;
      toolchain = "${toolchains}/XcodeDefault.xctoolchain";
      sdk = "${sdks}/${sdkName}";
      platform = "${platforms}/${xcodePlatform}.platform";
  
negative.code:     --subst-var-by DEVELOPER_DIR $out/Applications/Xcode.app/Contents/Developer
    chmod +x $out/bin/xcode-select
  
    cp ${xcrun}/bin/xcrun $out/bin/xcrun
  
    for bin in PlistBuddy actool builtin-copy builtin-copyPlist \
               builtin-copyStrings builtin-copyTiff \
  