$OpenBSD$

Index: src/mongo/db/repl/master_slave.cpp
--- src/mongo/db/repl/master_slave.cpp.orig
+++ src/mongo/db/repl/master_slave.cpp
@@ -78,6 +78,7 @@ using std::endl;
 using std::max;
 using std::min;
 using std::set;
+using std::string;
 using std::stringstream;
 using std::unique_ptr;
 using std::vector;