--- ray/src/gen/genprism.c	1991/11/12 17:04:46	2.1
+++ ray/src/gen/genprism.c	1993/06/04 14:32:05	2.3
@@ -16,6 +16,8 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  <stdio.h>
 
+#include  <math.h>
+
 #include  <ctype.h>
 
 #define  MAXVERT	1024		/* maximum # vertices */
@@ -36,7 +38,6 @@ main(argc, argv)
 int  argc;
 char  **argv;
 {
-	double  atof();
 	int  an;
 	
 	if (argc < 4)