{
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
sigsegv_handler);
+#ifdef LISP_FEATURE_SB_THREAD
undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
handle_rt_signal);
+#endif
undoably_install_low_level_interrupt_handler(SIGCONT,
sigcont_handler);
}