src/Pure/System/build.ML

         (Options.int options "parallel_proofs_threshold")
     |> Unsynchronized.setmp Multithreading.trace (Options.int options "threads_trace")
     |> Unsynchronized.setmp Multithreading.max_threads (Options.int options "threads")
     |> no_document options ? Present.no_document
     |> Unsynchronized.setmp quick_and_dirty (Options.bool options "quick_and_dirty")
+    |> Unsynchronized.setmp Toplevel.skip_proofs (Options.bool options "skip_proofs")
     |> Unsynchronized.setmp Printer.show_question_marks_default
         (Options.bool options "show_question_marks")
     |> Unsynchronized.setmp Name_Space.names_long_default (Options.bool options "names_long")
     |> Unsynchronized.setmp Name_Space.names_short_default (Options.bool options "names_short")
     |> Unsynchronized.setmp Name_Space.names_unique_default (Options.bool options "names_unique")