--- ray/src/gen/genbox.c	1991/12/19 15:08:16	2.2
+++ ray/src/gen/genbox.c	1993/08/02 14:22:59	2.4
@@ -12,7 +12,10 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  <stdio.h>
 
-#ifndef atof
+#include  <math.h>
+
+
+#ifdef  DCL_ATOF
 extern double  atof();
 #endif