--- ray/src/meta/mgvars.c	2003/11/14 00:14:40	1.4
+++ ray/src/meta/mgvars.c	2004/03/28 20:33:13	1.6
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: mgvars.c,v 1.4 2003/11/14 00:14:40 schorsch Exp $";
+static const char	RCSid[] = "$Id: mgvars.c,v 1.6 2004/03/28 20:33:13 schorsch Exp $";
 #endif
 /*
  *  mgvars.c - routines dealing with graph variables.
@@ -16,6 +16,7 @@ static const char	RCSid[] = "$Id: mgvars.c,v 1.4 2003/
 #include  <ctype.h>
 
 #include  "rtprocess.h"
+#include  "rtmisc.h"
 #include  "rterror.h"
 #include  "rtio.h"
 #include  "calcomp.h"
@@ -577,8 +578,8 @@ register char  **pathlist
 
 int
 mgcurve(			/* get a curve's (unmapped) values */
-int  c,
-int  (*f)()
+	int  c,
+	void (*f)(int c, double x, double y)
 )
 {
 	int  nargs;