--- ray/src/gen/genbox.c	1993/06/04 14:29:58	2.3
+++ ray/src/gen/genbox.c	1993/08/02 14:22:59	2.4
@@ -15,6 +15,10 @@ static char SCCSid[] = "$SunId$ LBL";
 #include  <math.h>
 
 
+#ifdef  DCL_ATOF
+extern double  atof();
+#endif
+
 char  let[]="0123456789._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
 char  *cmtype;		/* ppd material type */