Index: src/ipe6upgrade/ipe6upgrade.cpp
--- src/ipe6upgrade/ipe6upgrade.cpp.orig
+++ src/ipe6upgrade/ipe6upgrade.cpp
@@ -32,6 +32,7 @@
 #include "ipeattributes.h"
 #include <cstdlib>
 
+using std::exit;
 using namespace ipe;
 
 // --------------------------------------------------------------------