--- src/google/protobuf/message.cc~

+++ src/google/protobuf/message.cc

@@ -32,6 +32,7 @@

 //  Based on original Protocol Buffers design by

 //  Sanjay Ghemawat, Jeff Dean, and others.

+#include <iostream>

 #include <stack>

 #include <google/protobuf/stubs/hash.h>