diff --git a/src/qtgui/main.cpp b/src/qtgui/main.cpp
index a3bcf4cc..d08e9099 100644
--- a/src/qtgui/main.cpp
+++ b/src/qtgui/main.cpp
@@ -1,5 +1,5 @@
 #ifndef lint
-static char rcsid[] = "@(#$Id: main.cpp,v 1.64 2007-11-21 14:15:48 dockes Exp $ (C) 2005 J.F.Dockes";
+static char rcsid[] = "@(#$Id: main.cpp,v 1.65 2008-01-24 09:34:16 dockes Exp $ (C) 2005 J.F.Dockes";
 #endif
 /*
  *   This program is free software; you can redistribute it and/or modify
@@ -18,6 +18,8 @@ static char rcsid[] = "@(#$Id: main.cpp,v 1.64 2007-11-21 14:15:48 dockes Exp $
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
+#include <cstdlib>
+
 #include "autoconfig.h"
 
 #include <unistd.h>