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+.\" Copyright (c) 1989, 1990 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Robert Paul Corbett.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	from: @(#)yacc.1	5.7 (Berkeley) 7/30/91
+.\"	$Id: yacc.1,v 1.1 1995/10/18 08:47:06 deraadt Exp $
+.\"
+.Dd July 30, 1991
+.Dt YACC 1
+.Os
+.Sh NAME
+.Nm yacc
+.Nd an
+.Tn LALR(1)
+parser generator
+.Sh SYNOPSIS
+.Nm yacc
+.Op Fl dlrtv
+.Op Fl b Ar prefix
+.Ar filename
+.Sh DESCRIPTION
+.Nm Yacc
+reads the grammar specification in the file
+.Ar filename
+and generates an
+.Tn LR(1)
+parser for it.
+The parsers consist of a set of
+.Tn LALR(1)
+parsing tables and a driver routine
+written in the C programming language.
+.Nm Yacc
+normally writes the parse tables and the driver routine to the file
+.Pa y.tab.c .
+.Pp
+The following options are available:
+.Bl -tag -width Ar
+.It Fl b Ar prefix
+The
+.Fl b
+option changes the prefix prepended to the output file names to
+the string denoted by
+.Ar prefix .
+The default prefix is the character
+.Ar y .
+.It Fl d
+The
+.Fl d
+option causes the header file
+.Pa y.tab.h
+to be written.
+.It Fl l
+If the
+.Fl l
+option is not specified,
+.Nm yacc
+will insert #line directives in the generated code.
+The #line directives let the C compiler relate errors in the
+generated code to the user's original code.
+If the
+.Fl l
+option is specified,
+.Nm yacc
+will not insert the #line directives.
+#line directives specified by the user will be retained.
+.It Fl r
+The
+.Fl r
+option causes
+.Nm yacc
+to produce separate files for code and tables.
+The code file is named
+.Pa y.code.c ,
+and the tables file is named
+.Pa y.tab.c .
+.It Fl t
+The
+.Fl t
+option changes the preprocessor directives generated by
+.Nm yacc
+so that debugging statements will be incorporated in the compiled code.
+.It Fl v
+The
+.Fl v
+option causes a human-readable description of the generated parser to
+be written to the file
+.Pa y.output .
+.Pp
+.Sh ENVIRONMENT
+The following environment variable is referenced by
+.Nm yacc :
+.Bl -tag -width TMPDIR
+.It Ev TMPDIR
+If the environment variable
+.Ev TMPDIR
+is set, the string denoted by
+.Ev TMPDIR
+will be used as the name of the directory where the temporary
+files are created.
+.El
+.Sh TABLES
+The names of the tables generated by this version of
+.Nm yacc
+are
+.Dq yylhs ,
+.Dq yylen ,
+.Dq yydefred ,
+.Dq yydgoto ,
+.Dq yysindex ,
+.Dq yyrindex ,
+.Dq yygindex ,
+.Dq yytable ,
+and
+.Dq yycheck .
+Two additional tables,
+.Dq yyname
+and
+.Dq yyrule ,
+are created if
+.Dv YYDEBUG
+is defined and non-zero.
+.Sh FILES
+.Bl -tag -width /tmp/yacc.uXXXXXXXX -compact
+.It Pa y.code.c
+.It Pa y.tab.c
+.It Pa y.tab.h
+.It Pa y.output
+.It Pa /tmp/yacc.aXXXXXX
+.It Pa /tmp/yacc.tXXXXXX
+.It Pa /tmp/yacc.uXXXXXX
+.El
+.Sh DIAGNOSTICS
+If there are rules that are never reduced, the number of such rules is
+written to the standard error.
+If there are any
+.Tn LALR(1)
+conflicts, the number of conflicts is also written
+to the standard error.
+.\" .Sh SEE ALSO
+.\" .Xr yyfix 1
+.Sh STANDARDS
+The
+.Nm yacc
+utility conforms to
+.St -p1003.2 .