--- ray/src/px/psum.c	1991/11/12 16:05:27	2.1
+++ ray/src/px/psum.c	1993/06/04 14:47:18	2.3
@@ -12,6 +12,8 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  <stdio.h>
 
+#include  <math.h>
+
 #include  "color.h"
 
 
@@ -39,7 +41,7 @@ main(argc, argv)
 int  argc;
 char  *argv[];
 {
-	double  d, atof();
+	double  d;
 	int  xres, yres;
 	int  an;