- "{\"-3d\", \".use3d\", XrmoptionNoArg, \"true\"},\n";
+ "{\"-3d\", \".use3d\", XrmoptionNoArg, \"true\"},\n" .
+ "{\"-no-3d\", \".use3d\", XrmoptionNoArg, \"false\"},\n";
+
+my $thread_default_opts =
+ "{\"-threads\", \".useThreads\", XrmoptionNoArg, \"True\"},\n" .
+ "{\"-no-threads\", \".useThreads\", XrmoptionNoArg, \"False\"},\n";