+/* Some systems (MSDOS) don't have SIGCONT.
+ Using SIGTERM here turns the signal-handling code below
+ into a no-op on such systems. */
+#ifndef SIGCONT
+# define SIGCONT SIGTERM
+#endif
+
+#if ! HAVE_SIGINTERRUPT
+# define siginterrupt(sig, flag) /* empty */
+#endif
+
+static sig_atomic_t volatile suspended;