Changes to support building on solaris, irix, and darwin. Also

removed test for working fork (AC_FORK).

lib/mt/CThreadRep.cpp

@@ -548,8 +548,12 @@ CThreadRep::threadSignalHandler(void* vrep)
 	// we exit the loop via thread cancellation in sigwait()
 	for (;;) {
 		// wait
+#if HAVE_POSIX_SIGWAIT
 		int signal;
 		sigwait(&sigset, &signal);
+#else
+		sigwait(&sigset);
+#endif
 
 		// if we get here then the signal was raised.  cancel the thread.
 		mainThreadRep->cancel();