FreeImage: folders restructurization

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+

+Installing libpng

+

+On Unix/Linux and similar systems, you can simply type

+

+    ./configure [--prefix=/path]

+    make check

+    make install

+

+and ignore the rest of this document.

+

+If configure does not work on your system and you have a reasonably

+up-to-date set of tools, running ./autogen.sh before running ./configure

+may fix the problem.  You can also run the individual commands in

+autogen.sh with the --force option, if supported by your version of

+the tools.  To be really sure that you aren't using any of the included

+pre-built scripts, you can do this:

+

+    ./configure --enable-maintainer-mode

+    make maintainer-clean

+    ./autogen.sh

+    ./configure [--prefix=/path] [other options]

+    make

+    make install

+    make check

+

+Instead, you can use one of the custom-built makefiles in the

+"scripts" directory

+

+    cp scripts/makefile.system makefile

+    make test

+    make install

+

+The files that are presently available in the scripts directory

+are listed and described in scripts/README.txt.

+

+Or you can use one of the "projects" in the "projects" directory.

+

+Before installing libpng, you must first install zlib, if it

+is not already on your system.  zlib can usually be found

+wherever you got libpng.  zlib can be placed in another directory,

+at the same level as libpng.

+

+If you want to use "cmake" (see www.cmake.org), type

+

+   cmake . -DCMAKE_INSTALL_PREFIX=/path

+   make

+   make install

+

+If your system already has a preinstalled zlib you will still need

+to have access to the zlib.h and zconf.h include files that

+correspond to the version of zlib that's installed.

+

+You can rename the directories that you downloaded (they

+might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.5"

+or "zlib125") so that you have directories called "zlib" and "libpng".

+

+Your directory structure should look like this:

+

+   ..       (the parent directory)

+      libpng  (this directory)

+          INSTALL (this file)

+          README

+          *.h

+          *.c

+          CMakeLists.txt    =>  "cmake" script

+          configuration files:

+             configure.ac, configure, Makefile.am, Makefile.in,

+             autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,

+             libpng-config.in, aclocal.m4, config.h.in, config.sub,

+             depcomp, install-sh, mkinstalldirs, test-pngtest.sh

+          contrib

+             gregbook

+             pngminim

+             pngminus

+             pngsuite

+             visupng

+          projects

+             visualc71

+             vstudio

+          scripts

+             makefile.*

+             *.def (module definition files)

+             etc.

+          pngtest.png

+          etc.

+      zlib

+          README

+          *.h

+          *.c

+          contrib

+          etc.

+

+If the line endings in the files look funny, you may wish to get the other

+distribution of libpng.  It is available in both tar.gz (UNIX style line

+endings) and zip (DOS style line endings) formats.

+

+If you are building libpng with MSVC, you can enter the

+libpng projects\visualc6 or visualc71 directory and follow the instructions

+in README.txt.

+

+Otherwise enter the zlib directory and follow the instructions in zlib/README,

+then come back here and run "configure" or choose the appropriate

+makefile.sys in the scripts directory.

+

+Copy the file (or files) that you need from the

+scripts directory into this directory, for example

+

+   MSDOS example: copy scripts\makefile.msc makefile

+   UNIX example:    cp scripts/makefile.std makefile

+

+Read the makefile to see if you need to change any source or

+target directories to match your preferences.

+

+Then read pnglibconf.dfa to see if you want to make any configuration

+changes.

+

+Then just run "make" which will create the libpng library in

+this directory and "make test" which will run a quick test that reads

+the "pngtest.png" file and writes a "pngout.png" file that should be

+identical to it.  Look for "9782 zero samples" in the output of the

+test.  For more confidence, you can run another test by typing

+"pngtest pngnow.png" and looking for "289 zero samples" in the output.

+Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare

+your output with the result shown in contrib/pngsuite/README.

+

+Most of the makefiles will allow you to run "make install" to

+put the library in its final resting place (if you want to

+do that, run "make install" in the zlib directory first if necessary).

+Some also allow you to run "make test-installed" after you have

+run "make install".

+

+Further information can be found in the README and libpng-manual.txt

+files, in the individual makefiles, in png.h, and the manual pages

+libpng.3 and png.5.