+#ifdef LISP_FEATURE_SB_THREAD
+ /* This parallels the same logic in globals.c for the
+ * single-threaded foreign_function_call_active, KLUDGE and
+ * all. */
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+ th->foreign_function_call_active = 0;
+#else
+ th->foreign_function_call_active = 1;
+#endif
+#endif