--- src/ipelua/ipeluaipelet.cpp.orig	2019-04-17 11:57:38.000000000 +0100
+++ src/ipelua/ipeluaipelet.cpp	2019-04-17 11:58:24.000000000 +0100
@@ -36,6 +36,8 @@
 #include <dlfcn.h>
 #endif
 
+#include <cstdlib>
+
 using namespace ipe;
 using namespace ipelua;