--- libcoyotl-3.1.0.orig/libcoyotl/command_line.cpp
+++ libcoyotl-3.1.0/libcoyotl/command_line.cpp
@@ -32,6 +32,9 @@
 //-----------------------------------------------------------------------
 
 #include "command_line.h"
+
+#include <cstring>
+
 using namespace libcoyotl;
 
 command_line::command_line(int argc, char * argv[], const set<string> & bool_opts)