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   */