--- ray/src/rt/mx_func.c	2004/03/30 16:13:01	2.8
+++ ray/src/rt/mx_func.c	2024/12/03 19:36:58	2.10
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: mx_func.c,v 2.8 2004/03/30 16:13:01 schorsch Exp $";
+static const char	RCSid[] = "$Id: mx_func.c,v 2.10 2024/12/03 19:36:58 greg Exp $";
 #endif
 /*
  *  mx_func.c - routine for mixture functions.
@@ -26,17 +26,17 @@ static const char	RCSid[] = "$Id: mx_func.c,v 2.8 2004
  */
 
 
-extern int
+int
 mx_func(			/* compute mixture function */
-	register OBJREC  *m,
+	OBJREC  *m,
 	RAY  *r
 )
 {
 	OBJECT	obj;
-	register int  i;
+	int  i;
 	double  coef;
 	OBJECT  mod[2];
-	register MFUNC  *mf;
+	MFUNC  *mf;
 
 	if (m->oargs.nsargs < 4)
 		objerror(m, USER, "bad # arguments");
@@ -53,7 +53,7 @@ mx_func(			/* compute mixture function */
 	setfunc(m, r);
 	errno = 0;
 	coef = evalue(mf->ep[0]);
-	if (errno == EDOM || errno == ERANGE) {
+	if ((errno == EDOM) | (errno == ERANGE)) {
 		objerror(m, WARNING, "compute error");
 		return(0);
 	}