/*	head.h	4.1	81/05/14	*/ADDR	maxoff;ADDR	localval;struct	nlist *symtab, *esymtab;struct	nlist *cursym;struct	nlist *lookup();struct	exec filhdr;long	var[36];int	xargc;MAP	txtmap;MAP	datmap;INT	wtflag;INT	fcor;INT	fsym;L_INT	maxfile;L_INT	maxstor;INT	signo;union {	struct	user U;	char	UU[ctob(UPAGES)];} udot;#define	u	udot.Uchar	*corfil, *symfil;