CHECK_LIBRARY_EXISTS(pthread sem_open "" HAVE_SEM_OPEN_LIB)
CHECK_LIBRARY_EXISTS(pthread sem_timedwait "" HAVE_SEM_TIMEDWAIT_LIB)
CHECK_LIBRARY_EXISTS(pthread pthread_mutex_timedlock "" HAVE_MUTEX_TIMEDLOCK_LIB)
CHECK_LIBRARY_EXISTS(pthread sem_open "" HAVE_SEM_OPEN_LIB)
CHECK_LIBRARY_EXISTS(pthread sem_timedwait "" HAVE_SEM_TIMEDWAIT_LIB)
CHECK_LIBRARY_EXISTS(pthread pthread_mutex_timedlock "" HAVE_MUTEX_TIMEDLOCK_LIB)