--- cctools/libobjc2/lock.h
+++ cctools/libobjc2/lock.h
@@ -36,6 +36,10 @@
 #if 1
 #		define INIT_LOCK(x) init_recursive_mutex(&(x))
 
+#ifdef __linux__
+#               define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
+#endif /* __linux__ */
+
 static inline void init_recursive_mutex(pthread_mutex_t *x)
 {
 	pthread_mutexattr_t recursiveAttributes;