--- a/calc.yy
+++ b/calc.yy
@@ -8,6 +8,7 @@
 
 #include <cmath>
 #include <cctype>
+#include <cstring>
 
 #include <vector>
 #include <sstream>
--- a/tinyxml/tinyxml.h
+++ b/tinyxml/tinyxml.h
@@ -28,6 +28,8 @@
 #include <string>
 #include <stdio.h>
 #include <assert.h>
+#include <cstring>
+#include <cstdlib>
 
 class TiXmlDocument;
 class TiXmlElement;
--- a/tinyxml/tinyxmlparser.cpp
+++ b/tinyxml/tinyxmlparser.cpp
@@ -24,6 +24,7 @@
 
 #include "tinyxml.h"
 #include <ctype.h>
+#include <cstring>
 
 const char* TiXmlBase::SkipWhiteSpace( const char* p )
 {