This is a port of libjpeg 6b to MSDOS/DJGPP.

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

        This port of libjpeg 6b supplies lossless crop for JPEG.
        The patch to implement this functionaly has been downloaded from:
          <http://ftp.debian.org/debian/pool/main/libj/libjpeg6b/libjpeg6b_6b-14.diff.gz>
        and applied to the standard jpeg-6b sources available at:
          <ftp://ftp.imagemagick.org/pub/ImageMagick/delegates/libjpeg-6b.tar.bz2>
        Apart from providing lossless crop functionality, 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 config.h files for djgpp (usualy not
        well maintained) distributed with the package.
        There are no djgpp specific changes to the sources. Only the usual
        configuration files have been added, especialy sed scripts to fix the
        libtool files (ltmain and ltconfig). They are located in the /djgpp
        subdir.
        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 note that you can ***NOT*** have installed both ports, jpeg6b
        and ljpeg6b, at the same time.  This is because all headers and libs
        have the same name, so they will overwrite each other.  I have no
        intention to resolve this name conflict.

        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 jpeg6bb.zip      or
          djtarx jpeg6bb.zip       or
          pkunzip -d jpeg6bb.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 jpeg6bs.zip      or
          djtarx jpeg6bs.zip       or
          pkunzip -d jpeg6bs.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)
          gcc411b.zip, gpp411b.zip, bnu2161b.zip, mak3792b.zip,
          fil40b.zip, shl20jb.zip, txt20b.zip,
          txi48b.zip, grep24b.zip, sed415b.zip,
          png1215b.zip and zlib123b.zip

        If you want to run the check you will need also:
          dif287b.zip

        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.  All the
        other packages are the ones I have used to build the binaries
        from this source.  Previuos versions of this packages may do the
        job 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.6b) 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.6b\djgpp\config x:/src/contrib/libjpeg.6b

        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.6b\djgpp\config x:/src/contrib/libjpeg.6b

        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 libjpeg specific bug reports to <jpeg-info@uunet.uu.net>.
        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>
