--- ray/src/meta/rast.h	2003/02/22 02:07:26	1.1
+++ ray/src/meta/rast.h	2003/07/14 22:24:00	1.2
@@ -1,8 +1,14 @@
-/* RCSid: $Id: rast.h,v 1.1 2003/02/22 02:07:26 greg Exp $ */
+/* RCSid: $Id: rast.h,v 1.2 2003/07/14 22:24:00 schorsch Exp $ */
 /*
  *   Structures for line segment output to raster files
  */
+#ifndef _RAD_RAST_H_
+#define _RAD_RAST_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define  NUMSCANS	16		/* number of scanlines per block */
 
 typedef struct {			/* raster scanline block */
@@ -40,3 +46,9 @@ extern SCANBLOCK  outblock;		/* output span */
 				somebelow(p,outblock.ytop+1))
 #define  innext(p)	(ydown ? somebelow(p,outblock.ybot) : \
 				someabove(p,outblock.ytop))
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_RAST_H_ */
+