void	addmake(Node*);
void	addrule(char*, Word*, char*, Word*, int, int, int, char*);
void	addrules(Word*, Word*, char*, int, int, int, char*);
void	addw(Word*, char*);
void	adelete(char*, char*, char*);
void	assert(char*, int);
int	assline(Biobuf *, Bufblock *);
long	atimeof(int, char*, char*);
void	atouch(char*, char*, char*);
void	bufcpy(Bufblock *, char *, int);
void	bulkmtime(char*);
void	dirtime(char*, char*);
char 	*charin(char *, char *);
void	clrmade(Node*);
void	delete(char*);
void	delword(Word*);
char	*dnext(void);
int	dopen(char*);
int	dorecipe(Node*);
void	dovars(Job*, int);
void	dumpa(char*, Arc*);
void	dumpj(char*, Job*, int);
void	dumpn(char*, Node*);
void	dumpr(char*, Rule*);
void	dumpv(char*);
void	dumpw(char*, Word*);
Word	*encodenulls(char*, int);
void	envinsert(char*, Word*);
void	execinit(void);
int	Execl(char*, char*, ...);
void	Exit(void);
Word	*expand(char*);
void	expandvars(char *, Bufblock *);
void	export(char*, Word *);
void	exportenv(Envy*, int);
void	expunge(int, char*);
void	fdelete(char*, char*, char*);
long	filetime(char*);
void	freebuf(Bufblock *);
void	front(char*);
void	frule(Word*);
long	ftimeof(int, char*, char*);
void	ftouch(char*, char*, char*);
void	gen(char*);
int	getfields(char*, char**, int);
int	getmfields(char*, char**, int);
void	glob(char*, void(*)(char*));
int	gmatch(char*, char*);
Node	*graph(char*);
void	growbuf(Bufblock *);
void	initenv(void);
long	mtime(char*);
long	timeof(char*, int);
void	insert(Bufblock *, int);
int	internalvar(char*, Word*);
void	ipop(void);
void	ipush(void);
void	killchildren(char*);
void	lex(Biobuf *, char*);
void	main(int, char**);
char	*Malloc(int);
void	makefile(void);
void	maketarget(char*);
int	match(char*, char*, char*);
void	mk(char*);
int	mninlist(char*, Word*, char*);
Arc	*newarc(Node*, Rule*, char*, Resub*);
Bufblock *newbuf(void);
Job	*newjob(Rule*, Node*, char*, Resub*, Word*, Word*, Word*, Word*);
Word	*newword(char*);
int	nextslot(void);
int	notifyf(void*, char*);
void	nproc(void);
void	nrep(void);
int	os_dup2(int, int);
int	outofdate(Node*, Arc*, int);
void	parse(char*, int, int, int);
void	prusage(void);
void	rcexec(char*, char*, Bufblock*);
void	rdump(char*, Resub*);
char	*Realloc(char*, int);
void	rinsert(Bufblock *, Rune);
void	rsub(char*, Rule*, Arc*, char*, char*);
char	*rulecnt(void);
void	run(Job*);
char	*setfields(char*);
void	setvar(char*, char*);
char	*shname(char*);
void	shprint(char*, Envy*, Bufblock*);
void	sigcatch(void);
Word	*stow(char*);
char	*strndup(char*, unsigned);
void	subsub(Word*, char*, Bufblock*);
void	subst(char*, char*, char*);
void	symdel(char*, int);
void	syminit(void);
Symtab	*symlook(char*, int, char*);
void	symstat(void);
void	symtraverse(int, void(*)(Symtab*));
void	timeinit(char*);
void	touch(char*);
void	update(int, Node*);
void	usage(void);
void	vardump(void);
void	varmatch(char*, Bufblock*);
int	waitfor(char*);
int	waitup(int, int*);
int	work(Node*, Node*, Arc*);
void	writeout(int, char*, char*);
void	wtobuf(Word*, Bufblock*);
char	*wtos(Word*);


/*	Unfortunately, Unix and Plan 9 have incompatible dup() functions.
 *	Mk should call os_dup2() to get the proper implementation.
 *	If someone forgets, this dup macro causes a compilation failure.
 *
 *	The os-... files should undef dup to access the system version.
 */

#define dup(x, y)	dup_should_be___os_dup2.(x, y)