--- ray/src/px/pic.h	1989/02/02 10:49:00	1.1
+++ ray/src/px/pic.h	2003/07/14 22:24:00	2.3
@@ -1,7 +1,13 @@
+/* RCSid: $Id: pic.h,v 2.3 2003/07/14 22:24:00 schorsch Exp $ */
 /* the following three structures are used by ciq */
 
-/* SCCSid "$SunId$ LBL" */
+#ifndef _RAD_PIC_H_
+#define _RAD_PIC_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int colormap[3][256];
 
 typedef unsigned char pixel;
@@ -14,3 +20,9 @@ typedef struct {
 
 /* image resolution */
 extern int	xmax,ymax;
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_PIC_H_ */
+