--- ray/src/cv/thf2rad.c	1991/11/12 17:01:57	2.1
+++ ray/src/cv/thf2rad.c	1993/08/02 14:08:55	2.4
@@ -13,6 +13,7 @@ static char SCCSid[] = "$SunId$ LBL";
  */
 
 #include <stdio.h>
+#include <math.h>
 
 #define MAXSTR		128		/* maximum string or id length */
 #define MAXPTS		2048		/* maximum points per object */
@@ -23,12 +24,15 @@ typedef struct {
 
 double	rad = 0.0;			/* line radius */
 
+#ifdef  DECL_ATOF
+extern double  atof();
+#endif
 
+
 main(argc, argv)
 int	argc;
 char	*argv[];
 {
-	extern double	atof();
 	char	*name = NULL;
 	int	an;