no, don't use pthreads extensions if we don't at least have timedlock (not going to bother making it two tests unless it's actually needed)

stepmania/src/arch/Threads/Threads_Pthreads.cpp

@@ -104,6 +104,7 @@ MutexImpl_Pthreads::~MutexImpl_Pthreads()
 }
 
 
+#if defined(HAVE_PTHREAD_MUTEX_TIMEDLOCK) || defined(DARWIN)
 static bool UseTimedlock()
 {
 #if defined(LINUX)
@@ -114,6 +115,7 @@ static bool UseTimedlock()
 
 	return true;
 }
+#endif
 
 bool MutexImpl_Pthreads::Lock()
 {
@@ -276,6 +278,7 @@ void SemaImpl_Pthreads::Post()
 
 bool SemaImpl_Pthreads::Wait()
 {
+#if defined(HAVE_PTHREAD_MUTEX_TIMEDLOCK) || defined(DARWIN)
 	if( UseTimedlock() )
 	{
 		timeval tv;
@@ -327,6 +330,7 @@ bool SemaImpl_Pthreads::Wait()
 		pthread_mutex_unlock( &m_Mutex );
 		return false;
 	}
+#endif
 
 	pthread_mutex_lock( &m_Mutex );
 	while( !m_iValue )