--- ray/src/common/linregr.c	1991/04/30 15:30:15	1.1
+++ ray/src/common/linregr.c	2003/02/25 02:47:21	2.4
@@ -1,16 +1,18 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: linregr.c,v 2.4 2003/02/25 02:47:21 greg Exp $";
 #endif
-
 /*
  * Basic linear regression calculation.
  */
 
+#include "copyright.h"
+
+#include <math.h>
+
 #include "linregr.h"
 
 
+void
 lrclear(l)			/* initialize sum */
 register LRSUM	*l;
 {
@@ -19,6 +21,7 @@ register LRSUM	*l;
 }
 
 
+int
 flrpoint(x, y, l)		/* add point (x,y) to sum */
 double	x, y;
 register LRSUM	*l;
@@ -32,6 +35,7 @@ register LRSUM	*l;
 }
 
 
+int
 lrfit(r, l)			/* compute linear regression */
 register LRLIN	*r;
 register LRSUM	*l;