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-rw-r--r--src/Fl_Graphics_Driver.cxx3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/Fl_Graphics_Driver.cxx b/src/Fl_Graphics_Driver.cxx
index 5386d5290..3ac4d3154 100644
--- a/src/Fl_Graphics_Driver.cxx
+++ b/src/Fl_Graphics_Driver.cxx
@@ -1,7 +1,7 @@
//
// Fl_Graphics_Driver class for the Fast Light Tool Kit (FLTK).
//
-// Copyright 2010-2020 by Bill Spitzak and others.
+// Copyright 2010-2021 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
@@ -29,6 +29,7 @@
#include <FL/Fl_Image_Surface.H>
#include <FL/math.h>
#include <FL/platform.H>
+#include <stdlib.h>
FL_EXPORT Fl_Graphics_Driver *fl_graphics_driver; // the current driver of graphics operations