diff --git a/src/template/darwin b/src/template/darwin
index 4fdbea27bf5..cd60b83fe07 100644
--- a/src/template/darwin
+++ b/src/template/darwin
@@ -7,6 +7,9 @@ USE_NAMED_POSIX_SEMAPHORES=1
 
 THREAD_SUPPORT=yes
 # verified Mac OS X 10.3.3, Darwin Kernel Version 7.3.0, 2004-04-07
+THREAD_CPPFLAGS="-D_REENTRANT -D_THREAD_SAFE -D_POSIX_PTHREAD_SEMANTICS"
+THREAD_LIBS="-lpthread"
+
 STRERROR_THREADSAFE=yes
 GETPWUID_THREADSAFE=yes
 GETHOSTBYNAME_THREADSAFE=yes