--- ./src/parser/pstring.cpp.orig	2015-12-02 14:38:44.658744408 +0000
+++ ./src/parser/pstring.cpp	2015-12-02 14:38:50.449658497 +0000
@@ -13,8 +13,6 @@
 #include <iostream>
 #include <vector>
 
-#include <boost/thread/mutex.hpp>
-
 using namespace std;
 
 namespace orcus {