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+This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
+
+Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+1.: DJGPP specific changes.
+ =======================
+
+ The DJGPP port of Bison offers LFN and SFN support depending on which
+ OS it is running. If LFN support is available or not is determinated at
+ run time. If LFN support is available (DOS session under Win9X, Win2K,
+ WinXP, etc.) the standard posix file name extensions will be used.
+ These are: y.tab.c, y.tab.c++, y.tab.h, y.output, etc. If only SFN
+ support is available (plain DOS), then the standard MSDOS short file
+ names will be used. These are: y_tab.c, y_tab.h, y.out, etc.
+ It should be noticed that this bison version needs the m4 program as
+ back end to generate the parser file (y.tab.c etc.) from the skeleton
+ files. This implies that m4 must always be installed to get bison
+ working. m4 will use a couple of m4 scripts that will be installed in
+ /dev/env/DJDIR/share/bison and shall not be removed.
+ It should also be noticed that the skeleton files bison.simple and
+ bison.hairy are no longer supported. This applies also to the environ-
+ ment variables BISON_HAIRY and BISON_SIMPLE. Those variables are *no*
+ longer honored at all.
+ The kind of skeleton file bison.hairy is no longer supported at all.
+ The skeleton file bison.simple is now called yacc.c and is an m4 script.
+ The other two skeleton files supported by this bison version are glr.c
+ and lalr1.cc. The first one is a generalized LR C parser based on
+ Bison's LALR(1) tables and the second one is a experimental C++ parser
+ class.
+ As has been told before, bison uses m4 to generate the parser file.
+ This is done by forking and using pipes for the IPC. MSDOS does not
+ support this functionality so this has been reproduced in the usual
+ way by redirecting stdin and stdout of bison and m4 to temporary files
+ and processing these files in sequence.
+ It should be noticed that due to the great amount of file names that do
+ not cleanly map to 8.3 file names, you will need an OS with LFN support
+ to configure and compile the sources. On Win98 this implies that the
+ generation of numeric tails for 8.3 file name aliases must be enabled
+ or the compilation will fail.
+
+
+ Please **read** the docs.
+
+
+2.: Installing the binary package.
+ ==============================
+
+2.1.: Copy the binary distribution into the top DJGPP installation directory,
+ just unzip it preserving the directory structure running *ONE* of the
+ following commands:
+ unzip32 bsn@PACKAGE_VERSION@b.zip or
+ djtarx bsn@PACKAGE_VERSION@b.zip or
+ pkunzip -d bsn@PACKAGE_VERSION@b.zip
+
+
+
+3.: Building the binaries from sources.
+ ===================================
+
+3.1.: Create a temporary directory and copy the source package into the
+ directory. If you download the source distribution from one of the
+ DJGPP sites, just unzip it preserving the directory structure
+ running *ONE* of the following commands:
+ unzip32 bsn@PACKAGE_VERSION@s.zip or
+ djtarx bsn@PACKAGE_VERSION@s.zip or
+ pkunzip -d bsn@PACKAGE_VERSION@s.zip
+ and proceed to the paragraph 3.3, below.
+
+3.2.: Source distributions downloaded from one of the GNU FTP sites need
+ some more work to unpack, if LFN support is not available. If LFN is
+ available then you can extract the source files from the archive with
+ any unzip program and proceed to the paragraph 3.3, below. Any file
+ name issue will be handled by the the DJGPP configuration files.
+ To unpack the source distribution on SFN systems, first, you MUST use
+ the `djunpack' batch file to unzip the package. That is because some
+ file names in the official distributions need to be changed to avoid
+ problems on the various platforms supported by DJGPP.
+ `djunpack' invokes the `djtar' program (that is part of the basic DJGPP
+ development kit) to rename these files on the fly given a file with
+ name mappings; the distribution includes a file `djgpp/fnchange.lst'
+ with the necessary mappings. So you need first to retrieve that batch
+ file, and then invoke it to unpack the distribution. Here's how:
+
+ djtar -x -p -o bison-@VERSION@/djgpp/djunpack.bat bison-@VERSION@.tar.gz > djunpack.bat
+ djunpack bison-@VERSION@.tar.gz
+
+ (The name of the distribution archive and the leading directory of the
+ path to `djunpack.bat' in the distribution will be different for
+ versions of Bison other than @VERSION@.)
+
+ If the argument to `djunpack.bat' include leading directories, it MUST
+ be given with the DOS-style backslashes; Unix-style forward slashes
+ will NOT work.
+
+ If the distribution comes as a .tar.bz2 archive, and your version of
+ `djtar' doesn't support bzip2 decompression, you need to unpack it as
+ follows:
+
+ bnzip2 bison-@VERSION@.tar.bz2
+ djtar -x -p -o bison-@VERSION@/djgpp/djunpack.bat bison-@VERSION@.tar > djunpack.bat
+ djunpack bison-@VERSION@.tar
+
+3.3.: To build the binaries you will need the following binary packages:
+ djdev203.zip (or a later but NOT a prior version)
+ bsh204b.zip (or a later but NOT a prior version)
+ gccNNNb.zip, gppNNN.zip, bnuNNNb.zip, makNNNb.zip, filNNNb.zip,
+ perlNNNb.zip, shlNNNb.zip, txtNNNb.zip, txiNNNb.zip, grepNNNb.zip,
+ sedNNNb.zip and m4NNN.zip
+
+ If you want to run the check you will need also:
+ difNNNb.zip
+
+ NNN represents the latest version number of the binary packages. All
+ this packages can be found in the /v2gnu directory of any
+ ftp.delorie.com mirror.
+ You will need bsh204b.zip or later and *NOT* a prior version or
+ the build will fail. The same applies to djdev203.zip. Please note
+ that Bison requires m4-144b.zip or later to work properly.
+
+3.4.: If for some reason you want to reconfigure the package cd into the top
+ srcdir (bison-@TREE_VERSION@) and run the following commands:
+ del djgpp\config.cache
+ make clean
+ djgpp\config
+
+ Please note that you *MUST* delete the config.cache file in the djgpp
+ subdir or you will not really reconfigure the sources because the
+ configuration informations will be read from the cache file instead
+ of being newly computed.
+ To build the programs in a directory other than where the sources are,
+ you must add the parameter that specifies the source directory,
+ e.g:
+ x:\src\gnu\bison-@TREE_VERSION@\djgpp\config x:/src/gnu/bison-@TREE_VERSION@
+
+ Lets assume you want to build the binaries in a directory placed on a
+ different drive (z:\build in this case) from where the sources are,
+ then you will run the following commands:
+ z:
+ md \build
+ cd \build
+ x:\src\gnu\bison-@TREE_VERSION@\djgpp\config x:/src/gnu/bison-@TREE_VERSION@
+
+ The order of the options and the srcdir option does not matter. You
+ *MUST* use forward slashes to specify the source directory.
+
+ The batch file will set same environment variables, make MSDOS specific
+ modifications to the Makefile.in's and supply all other needed options
+ to the configure script.
+
+3.5.: To compile the package run from the top srcdir the command:
+ make
+
+3.6.: Now you can run the tests if you like. From the top srcdir run the
+ command:
+ make check
+
+ No test should fail but the tests #131 (Doxygen Public Documentation)
+ and #132 (Doxygen Private Documentation) will be skipped. Please note
+ that the testsuite only works with LFN available. On plain DOS, most
+ of the tests will fail due to invalid DOS names.
+
+3.7.: To install the binaries, header, library, catalogs, and info docs
+ run the following command from the top srcdir:
+ make install
+
+ This will install the products into your DJGPP installation tree given
+ by the default prefix "/dev/env/DJDIR". If you prefer to install them
+ into some other directory you will have to set prefix to the appropiate
+ value:
+ make install prefix=z:/some/other/place
+
+
+
+ Send GNU bison specific bug reports to <bug-bison@gnu.org>.
+ Send suggestions and bug reports concerning the DJGPP port to
+ comp.os.msdos.djgpp or <djgpp@delorie.com>.
+
+
+Enjoy.
+
+ Guerrero, Juan Manuel <juan.guerrero@gmx.de>