--- Fltk/messageWindow.cpp-xxx	2009-07-20 16:50:18.000000000 -0500
+++ Fltk/messageWindow.cpp	2009-07-20 16:50:28.000000000 -0500
@@ -4,6 +4,7 @@
 // bugs and problems to <gmsh@geuz.org>.
 
 #include <string.h>
+#include <cstdio>
 #include <FL/Fl_Box.H>
 #include <FL/Fl_Return_Button.H>
 #include <FL/fl_ask.H>