--- a/src/google/protobuf/stubs/port.h	(index)
+++ b/src/google/protobuf/stubs/port.h	(working tree)
@@ -31,6 +31,10 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_PORT_H_
 #define GOOGLE_PROTOBUF_STUBS_PORT_H_
 
+#include <util/generic/string.h>
+#include <util/stream/input.h>
+#include <util/stream/output.h>
+#include <util/system/types.h>
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>