This is a port of libpng 1.2.12 to MSDOS/DJGPP.

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

	There are no djgpp specific changes to the sources. Only the usual
	configuration files have been added. They are located in the /djgpp
	subdir.

	To use and compile from sources this library you will have to install
	the zlib library.
	  
	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 png1212b.zip      or
	  djtarx png1212b.zip       or
	  pkunzip -d png1212b.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 png1212s.zip      or
	  djtarx png1212s.zip       or
	  pkunzip -d png1212s.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)
	  gcc410b.zip, gpp410b.zip, bnu2161b.zip, mak3791b.zip,
	  fil40b.zip, shl20jb.zip, txt20b.zip,
	  txi48b.zip, grep24b.zip, sed415b.zip,
	  zlib123b.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.

3.4.:   If for some reason you want to reconfigure the package cd into the top
	srcdir (libpng-1.212) 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\libpng-1.212\djgpp\config x:/src/contrib/libpng-1.212

	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\libpng-1.212\djgpp\config x:/src/contrib/libpng-1.212

	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.

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 libpng specific bug reports to <glennrp@users.sourceforge.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>
