Add missing #include in fltk-versions example program.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12312 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/fltk-versions.cxx

@@ -3,7 +3,7 @@
 //
 // Library version test program for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2015 by Bill Spitzak and others.
+// Copyright 1998-2017 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -21,6 +21,8 @@
 #include <FL/Fl_Box.H>
 #include <FL/fl_ask.H>
 
+#include <stdio.h>
+
 static char version[8][80] = { "","","","","","","","" };
 
 int main(int argc, char **argv) {