This is a port of zlib 1.3 to MSDOS/DJGPP.

  zlib is designed to be a free, general-purpose, legally unencumbered
  -- that is, not covered by any patents -- lossless data-compression library
  for use on virtually any computer hardware and operating system.  The zlib
  data format is itself portable across platforms. Unlike the LZW compression
  method used in Unix compress(1) and in the GIF image format, the compression
  method currently used in zlib essentially never expands the data. (LZW can
  double or triple the file size in extreme cases.) zlib's memory footprint is
  also independent of the input data and can be reduced, if necessary, at some
  cost in compression.



1.:     DJGPP specific changes.
        =======================

        There are no DJGPP specific changes at all.  Only the usual configuration
        files have been added.  As usual they are located in the "djgpp" directory.

        Please read the docs to become familiar with the products.



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 zlb13b.zip      or
          djtarx zlb13b.zip       or
          pkunzip -d zlb13b.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 zlb13s.zip      or
          djtarx zlb13s.zip       or
          pkunzip -d zlb13s.zip

3.2.:   To build the binaries you will need the following binary packages:
          djdev205.zip (or a later but NOT a prior version)
          bsh4428b.zip (or a later but NOT a prior version)
          gccNNNb.zip, gppNNN.zip, bnuNNNb.zip, makNNNb.zip, filNNNb.zip,
          shlNNNb.zip, txtNNNb.zip, txiNNNb.zip, grepNNNb.zip, and
          sedNNNb.zip

        If you want to run the check you will need also:
          difNNNb.zip and mktmpNNNb.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 bsh4428b.zip or later and *NOT* a prior version or
        the build will fail.  The same applies to djdev205.zip.

3.3.:   The package has been configured to be build in a separate build directory
        under the top srcdir (aka zlib-1.3).  To build the binaries cd
        into "0build" directory.  If for some reason you want to reconfigure the
        package cd into the build directory and run the following commands:
          del config.cache
          make clean
          ..\djgpp\config ./..

        Please note that you _must_ delete the config.cache file in the 0build
        directory or you will not really reconfigure the sources because the
        configuration informations will be read from the cache file instead
        of being newly computed.

        config.bat, among other things, will start the configure script passing
        to it a couple of arguments.  You can control these argument passing the
        following command line arguments to config.bat:
          nls or no-nls, default nls.  NLS support enabled.
          cache or no-cache, default cache.  Cache in build directory.
          dep or no-dep, default no-dep.  No dependency tracking.
          silent or no-silent, default silent.  Controls the verbosity of the
                                                build process.
        All other configure specific options are not controled by config.bat so
        they are passed verbatim to the configure script if they are supplied.
        If no arguments are passed to config.bat then the default values are
        used.


        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\contrib\zlib-1.3\djgpp\config x:/src/contrib/zlib-1.3

        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\contrib\zlib-1.3\djgpp\config x:/src/contrib/zlib-1.3

        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.

3.4.:   To compile the package run from the directory where you have configured
        the sources the command:
          make

3.5.:   Now you can run the tests if you like. From the directory where you have
        configured the sources run the command:
          make check

        No test should fail.

3.6.:   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 appropriate
        value:
          make install prefix=z:/some/other/place



        Send zlib specific bug reports to <zlib@gzip.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>
