From 691be54ca2b4d76f2e32f165c2513727c32a4de7 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Tue, 22 Jan 2013 18:53:51 +0100
Subject: [PATCH] Keep Linux happy.

---
 simgear/structure/StateMachine.hxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/simgear/structure/StateMachine.hxx b/simgear/structure/StateMachine.hxx
index 34fb84e1..7e9f4be5 100644
--- a/simgear/structure/StateMachine.hxx
+++ b/simgear/structure/StateMachine.hxx
@@ -23,6 +23,7 @@
 #define SIMGEAR_STATE_MACHINE_H
 
 #include <memory>
+#include <string>
 
 #include <simgear/structure/SGReferenced.hxx>
 #include <simgear/structure/SGSharedPtr.hxx>