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--- a/libupnpp/soaphelp.cxx
+++ b/libupnpp/soaphelp.cxx
@@ -16,6 +16,10 @@
  */
 #include "config.h"
 
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
 #include <iostream>
 using namespace std;