--- OpenSceneGraph-3.4.0/src/OpenThreads/pthreads/PThread.cpp
+++ OpenSceneGraph-3.4.0/src/OpenThreads/pthreads/PThread.cpp
@@ -57,6 +57,10 @@
 
 #include <iostream>
 
+#ifdef __powerpc64__
+#include <string.h>
+#endif
+
 using namespace OpenThreads;
 
 #ifdef DEBUG
