--- ray/src/common/calcomp.h	1992/09/21 12:01:33	2.2
+++ ray/src/common/calcomp.h	1995/02/17 18:34:41	2.4
@@ -32,7 +32,7 @@ typedef struct epnode {
 	double	num;		/* number */
 	char  *name;		/* symbol name */
 	int  chan;		/* channel number */
-	long  tick;		/* timestamp */
+	unsigned long  tick;	/* timestamp */
 	struct vardef {
 	    char  *name;		/* variable name */
 	    int	 nlinks;		/* number of references */
@@ -55,13 +55,14 @@ extern double  eval(), varvalue(), chanvalue(), funval
 extern double  argument(), getnum();
 extern double  (*eoper[])();
 extern int  getinum();
-extern char  *getname(), *qualname(), *setcontext(), *argfun();
+extern char  *getname(), *qualname(), *argfun();
+extern char  *setcontext(), *pushcontext(), *popcontext();
 extern EPNODE  *eparse(), *ekid(), *dlookup(), *dpop(), *dfirst(), *dnext();
 extern EPNODE  *getdefn(), *getchan();
 extern EPNODE  *getE1(), *getE2(), *getE3(), *getE4(), *getE5(), *rconst();
 extern VARDEF  *varinsert(), *varlookup(), *argf();
 extern LIBR  *liblookup();
-extern long  eclock;
+extern unsigned long  eclock;
 extern int  nextc;
 
 #define	 evalue(ep)	(*eoper[(ep)->type])(ep)