--- ray/src/px/ciq.h	1989/02/02 10:48:58	1.1
+++ ray/src/px/ciq.h	2003/07/14 22:24:00	2.3
@@ -1,8 +1,16 @@
+/* RCSid: $Id: ciq.h,v 2.3 2003/07/14 22:24:00 schorsch Exp $ */
+
+#ifndef _RAD_CIQ_H_
+#define _RAD_CIQ_H_
+
 #include <stdio.h>
 
-/* SCCSid "$SunId$ LBL" */
 #include "pic.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define red(i) ((i)>>7&0xf8|4)	/* 5 bits red, 5 bits green, 5 bits blue */
 #define gre(i) ((i)>>2&0xf8|4)
 #define blu(i) ((i)<<3&0xf8|4)
@@ -17,3 +25,10 @@ extern int n;		/* number of colors in it */
 #define line3alloc(xdim)	(rgbpixel *)emalloc(sizeof(rgbpixel)*xdim)
 
 extern char	*emalloc();
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_CIQ_H_ */
+