static size_t gs_nThreadsBeingDeleted = 0;
 
 // a mutex to protect gs_nThreadsBeingDeleted
-static pthread_mutex_t gs_mutexDeleteThread = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t gs_mutexDeleteThread;
 
 // and a condition variable which will be signaled when all
 // gs_nThreadsBeingDeleted will have been deleted
 
 void wxThread::Yield()
 {
+#ifdef HAVE_SCHED_YIELD
     sched_yield();
+#endif
 }
 
 void wxThread::Sleep(unsigned long milliseconds)
     gs_mutexGui->Lock();
 #endif // wxUSE_GUI
 
+    // under Solaris we get a warning from CC when using
+    // PTHREAD_MUTEX_INITIALIZER, so do it dynamically
+    pthread_mutex_init(&gs_mutexDeleteThread, NULL);
+
     return TRUE;
 }