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    make maintainer-clean
    ./autogen.sh --maintainer --clean
    ./autogen.sh --maintainer
    ./configure [--prefix=/path] [other options]
    make
    make install
    make check

III. Using scripts/makefile*

Instead, you can use one of the custom-built makefiles in the
"scripts" directory

    cp scripts/pnglibconf.h.prebuilt pnglibconf.h
    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; otherwise go to http://zlib.net.  You can place
zlib in in the same directory as libpng or in another directory.

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.

If you wish to test with a particular zlib that is not first in the
standard library search path, put ZLIBLIB, ZLIBINC, CPPFLAGS, LDFLAGS,
and LD_LIBRARY_PATH in your environment before running "make test"
or "make distcheck":

ZLIBLIB=/path/to/lib export ZLIBLIB
ZLIBINC=/path/to/include export ZLIBINC
CPPFLAGS="-I$ZLIBINC" export CPPFLAGS
LDFLAGS="-L$ZLIBLIB" export LDFLAGS
LD_LIBRARY_PATH="$ZLIBLIB:$LD_LIBRARY_PATH" export LD_LIBRARY_PATH

If you are using one of the makefile scripts, put ZLIBLIB and ZLIBINC
in your environment and type "make ZLIBLIB=$ZLIBLIB ZLIBINC=$ZLIBINC test".

IV. Using cmake

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

   cmake . -DCMAKE_INSTALL_PREFIX=/path
   make
   make install

As when using the simple configure method described above, "/path" points to
the installation directory where you want to put the libpng "lib", "include",
and "bin" subdirectories.

V. Directory structure

You can rename the directories that you downloaded (they
might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.8"
or "zlib128") 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  => libpng source files
          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
             arm-neon, conftest, examples, gregbook, libtests, pngminim,
             pngminus, pngsuite, tools, visupng
          projects
             cbuilder5, owatcom, visualc71, vstudio, xcode
          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.

VI. Building with project files

If you are building libpng with MSVC, you can enter the
libpng projects\visualc71 or vstudio 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.

VII. Building with makefiles

Copy the file (or files) that you need from the
scripts directory into this directory, for example

   MSDOS example: copy scripts\makefile.msc makefile
                  copy scripts\pnglibconf.h.prebuilt pnglibconf.h
   UNIX example:  cp scripts/makefile.std makefile
                  cp scripts/pnglibconf.h.prebuilt pnglibconf.h

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.