Berkeley Yacc owes much to the unflagging efforts of Keith Bostic.His badgering kept me working on it long after I was ready to quit.     Berkeley Yacc is based on the excellent algorithm for computing LALR(1)lookaheads developed by Tom Pennello and Frank DeRemer.  The algorithm isdescribed in their almost impenetrable article in TOPLAS 4,4.     Finally, much of the credit for the latest version must go to thosewho pointed out deficiencies of my earlier releases.  Among the mostprolific contributors were	  Benson I. Margulies	  Dave Gentzel	  Antoine Verheijen	  Peter S. Housel	  Dale Smith	  Ozan Yigit	  John Campbell	  Bill Sommerfeld	  Paul Hilfinger	  Gary Bridgewater	  Dave Bakken	  Dan Lanciani	  Richard Sargent	  Parag Patel