Berkeley Yacc

Berkeley Yacc (byacc) is generally conceded to be the best yacc variant available. In contrast to bison, it is written to avoid dependencies upon a particular compiler.
Byacc was written around 1990 by Robert Corbett who is the original author of bison. Originally written in K&R C, I have modified it to conform to ANSI C, and made other improvements.
Enhancements:
- configure.in: add AC_ARG_PROGRAM to make --program-prefix, etc., work.
- makefile.in: first cut of script to support --program-prefix
- configure.in: reorder AC_INIT/AC_CONFIG_HEADER to make this "work" with autoconf 2.52
- makefile.in: modify so DESTDIR works
- makefile.in: use EXEEXT and OBJEXT
- configure.in: use CF_PROG_EXT generate a config.h
- defs.h: make this use the generated config.h
- skeleton.c: add a forward-reference for yyparse()
- aclocal.m4: add CF_CHECK_CACHE, needed for CF_PROG_EXT
- yacc.1: remove the discussion of TMPDIR since it is obsolete
- skeleton.c: fix a couple of minor compiler-warnings in the skeleton
- defs.h: remove action_file_name, etc., since we use tmpfile() now.
- main.c: use tmpfile() for opening the working files. This quiets an idiot-warning advertising the use of mkstemp().
- output.c: Do not close temporary-files here, since they are opened with tmpfile(). Just rewind them, and theyre ready to read back the data stored in them.
- test/grammar.output, test/grammar.tab.c, test/grammar.tab.h: RCS_BASE
- makefile.in: turn on "make check" rule
- test/calc.output, test/run_test.sh, test/calc.tab.h: RCS_BASE
- test/ftp.tab.c: yyparse() is now yyparse(void)
- test/calc.tab.c: RCS_BASE
- test/error.tab.c: yyparse() is now yyparse(void)
- test/README: RCS_BASE
- yacc.1: various typography fixes prompted by Debian #100947
- aclocal.m4, makefile.in, configure.in: RCS_BASE
- README: updated to note that this is not the original