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diff --git a/fltk/fltk/FL_VERSION.h b/fltk/fltk/FL_VERSION.h
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+/*! \file
+
+The FLTK version number. Allows you to write conditionally compiled
+code for different versions of FLTK. This file may be included by C
+code in case you need it there.
+
+FL_VERSION is a macro double that describes the major, minor, and
+patch version numbers. The integer value is the major number. One
+digit is used for the minor number, and three for the "patch" number
+which is increased for each binary differnt release (it can go to 999).
+
+Because double cannot be used in #if statements, the integer
+numbers are in the FL_MAJOR_VERSION, FL_MINOR_VERSION, and
+FL_PATCH_VERSION macro constants.
+
+*/
+
+#ifndef FL_VERSION
+
+# define FL_MAJOR_VERSION 2 //!< The major release number, 1 or 2
+# define FL_MINOR_VERSION 1 //!< The minor release number, 0-9
+# define FL_PATCH_VERSION 0 //!< The patch number, 0-999
+# define FL_VERSION	  2.1000
+
+#if defined(__cplusplus) || defined(DOXYGEN) /* Allow this file to be included by C code */
+#include "FL_API.h"
+namespace fltk {
+
+/*!
+  Returns the value of FL_VERSION that FLTK was compiled with.
+  This can be compared to the FL_VERSION macro to see if the shared
+  library of fltk your program linked with is up to date.
+*/
+FL_API double version();
+
+}
+#endif
+
+#endif