--- ray/src/px/greyscale.c	1989/02/02 10:49:20	1.1
+++ ray/src/px/greyscale.c	2003/02/22 02:07:27	2.6
@@ -1,9 +1,6 @@
-/* Copyright (c) 1986 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: greyscale.c,v 2.6 2003/02/22 02:07:27 greg Exp $";
 #endif
-
 /*
  *  greyscale.c - program to produce grey test levels.
  *
@@ -12,6 +9,8 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  <stdio.h>
 
+#include  <math.h>
+
 #include  "color.h"
 
 
@@ -23,7 +22,7 @@ int  argc;
 char  *argv[];
 {
 	COLOR  col;
-	double  d1,d2,d3, atof(), log();
+	double  d1,d2,d3;
 	int  i;
 
 	printargs(argc, argv, stdout);
@@ -60,7 +59,6 @@ char  *argv[];
 greyscale(col0)			/* output our grey scale */
 COLOR  col0;
 {
-	double  exp();
 	COLOR  col1, col2, scanline[512];
 	double  x;
 	int  j;