1234949SbaptBerkeley Yacc (byacc) is a LALR(1) parser generator. Berkeley Yacc 2234949Sbapthas been made as compatible as possible with AT&T Yacc. Berkeley 3234949SbaptYacc can accept any input specification that conforms to the AT&T 4234949SbaptYacc documentation. 5234949Sbapt 6234949SbaptSome programs depend on a byacc (instead of bison). 7