extern ndptr hashtab[]; /* hash table for macros etc. */

extern char buf[]; /* push-back buffer */

extern char *bp; /* first available character */

extern char *endpbb; /* end of push-back buffer */

extern stae mstack[]; /* stack of m4 machine */

extern char *ep; /* first free char in strspace */

extern char *endest; /* end of string space */

extern int sp; /* current m4 stack pointer */

extern int fp; /* m4 call frame pointer */

extern FILE *infile[]; /* input file stack (0=stdin) */

extern FILE *outfile[]; /* diversion array(0=bitbucket)*/

extern FILE *active; /* active output file pointer */

extern char *m4temp; /* filename for diversions */

extern int ilevel; /* input file stack pointer */

extern int oindex; /* diversion index.. */

extern char *null; /* as it says.. just a null.. */

extern char *m4wraps; /* m4wrap string default.. */

extern char lquote; /* left quote character (`) */

extern char rquote; /* right quote character (') */

extern char scommt; /* start character for comment */

extern char ecommt; /* end character for comment */