--- ray/src/meta/plot.h	2003/06/08 12:03:10	1.2
+++ ray/src/meta/plot.h	2003/07/14 22:24:00	1.3
@@ -1,8 +1,13 @@
-/* RCSid: $Id: plot.h,v 1.2 2003/06/08 12:03:10 schorsch Exp $ */
+/* RCSid: $Id: plot.h,v 1.3 2003/07/14 22:24:00 schorsch Exp $ */
 /*
  *   Definitions for plotting routines
  */
+#ifndef _RAD_PLOT_H_
+#define _RAD_PLOT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 #define  NPATS  9		/* number of fill patterns */
 
@@ -18,4 +23,9 @@ extern unsigned char  pattern[][PATSIZE/8][PATSIZE];	/
 extern void set(int  attrib, char  *value);
 extern void reset(int  attrib);
 extern void unset(int  attrib);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_PLOT_H_ */