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diff --git a/externals/gridflow/bundled/Base/GemExportDef.h b/externals/gridflow/bundled/Base/GemExportDef.h
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+/*-----------------------------------------------------------------
+LOG
+ GEM - Graphics Environment for Multimedia
+
+ Export crap
+
+ Copyright (c) 1997-1999 Mark Danks. mark@danks.org
+ Copyright (c) Günther Geiger. geiger@epy.co.at
+ Copyright (c) 2001-2002 IOhannes m zmoelnig. forum::für::umläute. IEM. zmoelnig@iem.kug.ac.at
+ For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ WARRANTIES, see the file, "GEM.LICENSE.TERMS" in this distribution.
+
+-----------------------------------------------------------------*/
+
+#ifndef INCLUDE_GEMEXPORTDEF_H_
+#define INCLUDE_GEMEXPORTDEF_H_
+
+#ifdef _MSC_VER
+
+/* turn of some warnings on vc-compilers */
+# pragma warning( disable : 4244 )
+# pragma warning( disable : 4305 )
+# pragma warning( disable : 4091 )
+// "switch" without "case" (just "default")
+# pragma warning( disable : 4065 )
+
+// Windows requires explicit import and exporting of functions and classes.
+// While this is a pain to do sometimes, in large software development
+// projects, it is very usefull.
+#ifdef GEM_INTERNAL // GEM exporting things
+#define GEM_EXTERN __declspec(dllexport)
+#else // other's importing
+#define GEM_EXTERN __declspec(dllimport)
+#endif // for GEM_INTERNAL
+
+#else // other OS's
+#define GEM_EXTERN
+#endif
+
+#endif // for header file