This is a port of Lib JPEG 8c to MSDOS/DJGPP.

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

        The goal of this port is to use the standard configure scripts
        distributed with the package to configure and compile the sources and
        not relay anymore on the special Makefile and jconfig.h files for DJGPP
        (usualy not well maintained) distributed with the package.  This means
        that I have not used the included DJGPP specific files jconfig.dj and
        Makefile.dj to compile these binaries.  I have not inspected those
        files closly so I do not know if they work or not.  If you prefer those
        over my approach to configure and compile the sources you are alone.

        There are no djgpp specific changes to the sources. The previous port
        was patched to implement lossless cropping; this functionality is now
        part of the official sources.  Only the usual configuration files have
        been added, especialy sed scripts to fix the libtool files and they are
        located in the /djgpp directory.

        As for all binaries and libraries that handle images of any kind, it
        should be noticed that files (streams) are *ALWAYS* openend in binary
        mode with all the well known implications on a DOS/WINDOWS OS if the
        stream is connected to STDIN and/or STDOUT when these are still
        connected to the console.

        To use and compile from sources this library you will have to install
        the zlib and png library.
          
        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 jpeg8cb.zip      or
          djtarx jpeg8cb.zip       or
          pkunzip -d jpeg8cb.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 jpeg8cs.zip      or
          djtarx jpeg8cs.zip       or
          pkunzip -d jpeg8cs.zip

3.2.:   To build the binaries you will need the following binary packages:
          djdev203.zip (or a later but NOT a prior version)
          bsh205b.zip  (or a later but NOT a prior version)
          gccNNNb.zip, bnuNNNb.zip, makNNNb.zip, filNNNb.zip, shlNNNb.zip,
          txtNNNb.zip, txiNNNb.zip, grepNNNb.zip, sedNNNb.zip, gwkNNNb.zip,
          mktmpNNb.zip, pngNNNb.zip and zlibNNNb.zip

        If you want to run the check you will need also:
          difNNNb.zip

        All this packages can be found in the v2gnu directory of any
        ftp.delorie.com mirror.  NNN stands for the newest port versions
        available when this port was build but older may do the work as well
        but I have not tested this.

3.3.:   If for some reason you want to reconfigure the package cd into the top
        srcdir (libjpeg.8c) 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\contrib\libjpeg.8c\djgpp\config x:/src/contrib/libjpeg.8c

        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\libjpeg.8c\djgpp\config x:/src/contrib/libjpeg.8c

        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 top srcdir the command:
          make

3.5.:   Now you can run the tests if you like.  From the top srcdir 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 appropiate
        value:
          make install prefix=z:/some/other/place



        Send Lib JPEG specific bug reports to <jpeg-info@uc.ag>.
        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>
