-*- Mode: Diff -*-

--- firebird/src/common/isc_s_proto.h
+++ firebird/src/common/isc_s_proto.h
@@ -37,6 +37,8 @@
 // Firebird platform-specific synchronization data structures
 
 #if defined(DARWIN)
+#define USE_POSIX_SEMAPHORE
+#define USE_SHARED_FUTEX
 #define USE_FILELOCKS
 #endif