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/src/FreeImage/Source/LibPNG/INSTALL

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  1
  2Installing libpng
  3
  4On Unix/Linux and similar systems, you can simply type
  5
  6    ./configure [--prefix=/path]
  7    make check
  8    make install
  9
 10and ignore the rest of this document.
 11
 12If configure does not work on your system and you have a reasonably
 13up-to-date set of tools, running ./autogen.sh before running ./configure
 14may fix the problem.  You can also run the individual commands in
 15autogen.sh with the --force option, if supported by your version of
 16the tools.  To be really sure that you aren't using any of the included
 17pre-built scripts, you can do this:
 18
 19    ./configure --enable-maintainer-mode
 20    make maintainer-clean
 21    ./autogen.sh
 22    ./configure [--prefix=/path] [other options]
 23    make
 24    make install
 25    make check
 26
 27Instead, you can use one of the custom-built makefiles in the
 28"scripts" directory
 29
 30    cp scripts/makefile.system makefile
 31    make test
 32    make install
 33
 34The files that are presently available in the scripts directory
 35are listed and described in scripts/README.txt.
 36
 37Or you can use one of the "projects" in the "projects" directory.
 38
 39Before installing libpng, you must first install zlib, if it
 40is not already on your system.  zlib can usually be found
 41wherever you got libpng.  zlib can be placed in another directory,
 42at the same level as libpng.
 43
 44If you want to use "cmake" (see www.cmake.org), type
 45
 46   cmake . -DCMAKE_INSTALL_PREFIX=/path
 47   make
 48   make install
 49
 50If your system already has a preinstalled zlib you will still need
 51to have access to the zlib.h and zconf.h include files that
 52correspond to the version of zlib that's installed.
 53
 54You can rename the directories that you downloaded (they
 55might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.5"
 56or "zlib125") so that you have directories called "zlib" and "libpng".
 57
 58Your directory structure should look like this:
 59
 60   ..       (the parent directory)
 61      libpng  (this directory)
 62          INSTALL (this file)
 63          README
 64          *.h
 65          *.c
 66          CMakeLists.txt    =>  "cmake" script
 67          configuration files:
 68             configure.ac, configure, Makefile.am, Makefile.in,
 69             autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
 70             libpng-config.in, aclocal.m4, config.h.in, config.sub,
 71             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
 72          contrib
 73             gregbook
 74             pngminim
 75             pngminus
 76             pngsuite
 77             visupng
 78          projects
 79             visualc71
 80             vstudio
 81          scripts
 82             makefile.*
 83             *.def (module definition files)
 84             etc.
 85          pngtest.png
 86          etc.
 87      zlib
 88          README
 89          *.h
 90          *.c
 91          contrib
 92          etc.
 93
 94If the line endings in the files look funny, you may wish to get the other
 95distribution of libpng.  It is available in both tar.gz (UNIX style line
 96endings) and zip (DOS style line endings) formats.
 97
 98If you are building libpng with MSVC, you can enter the
 99libpng projects\visualc6 or visualc71 directory and follow the instructions
100in README.txt.
101
102Otherwise enter the zlib directory and follow the instructions in zlib/README,
103then come back here and run "configure" or choose the appropriate
104makefile.sys in the scripts directory.
105
106Copy the file (or files) that you need from the
107scripts directory into this directory, for example
108
109   MSDOS example: copy scripts\makefile.msc makefile
110   UNIX example:    cp scripts/makefile.std makefile
111
112Read the makefile to see if you need to change any source or
113target directories to match your preferences.
114
115Then read pnglibconf.dfa to see if you want to make any configuration
116changes.
117
118Then just run "make" which will create the libpng library in
119this directory and "make test" which will run a quick test that reads
120the "pngtest.png" file and writes a "pngout.png" file that should be
121identical to it.  Look for "9782 zero samples" in the output of the
122test.  For more confidence, you can run another test by typing
123"pngtest pngnow.png" and looking for "289 zero samples" in the output.
124Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
125your output with the result shown in contrib/pngsuite/README.
126
127Most of the makefiles will allow you to run "make install" to
128put the library in its final resting place (if you want to
129do that, run "make install" in the zlib directory first if necessary).
130Some also allow you to run "make test-installed" after you have
131run "make install".
132
133Further information can be found in the README and libpng-manual.txt
134files, in the individual makefiles, in png.h, and the manual pages
135libpng.3 and png.5.