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+
+Installing libpng version 1.2.29 - May 8, 2008
+
+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.  If you run 'libtoolize --force', though, this will replace
+the distributed, patched, version of ltmain.sh with an unpatched version
+and your shared library builds may fail to produce libraries with the
+correct version numbers.
+
+Instead, you can use one of the custom-built makefiles in the
+"scripts" directory
+
+    cp scripts/makefile.system makefile
+    make test
+    make install
+
+Or you can use one of the "projects" in the "projects" directory.
+
+If you want to use "cmake" (see www.cmake.org), copy CMakeLists.txt
+from the "scripts" directory to this directory and type
+
+   cmake . [-DPNG_MMX=YES] -DCMAKE_INSTALL_PREFIX=/path
+   make
+   make install
+
+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 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-1.2.29" or "lpng109" and "zlib-1.2.1"
+or "zlib121") 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
+          contrib
+             gregbook
+             pngminus
+             pngsuite
+             visupng
+          projects
+             beos
+             c5builder (Borland)
+             visualc6 (msvc)
+             netware.txt
+             wince.txt
+          scripts
+             makefile.*
+          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 directory and follow the instructions in
+projects\visualc6\README.txt.
+
+You can build libpng for WindowsCE by downloading and installing
+the projects\wince directory as instructed in the projects\wince.txt file, and
+then following the instructions in the README* files.  Similarly, you can
+build libpng for Netware or Beos as instructed in projects\netware.txt
+or projects\beos.
+
+Else 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.
+
+The files that are presently available in the scripts directory
+include
+
+ CMakeLists.txt    =>  "cmake" script
+ makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.elf      =>  Linux/ELF makefile symbol versioning,
+                       gcc, creates libpng12.so.0.1.2.29)
+ makefile.linux    =>  Linux/ELF makefile
+                       (gcc, creates libpng12.so.0.1.2.29)
+ makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
+ makefile.knr      =>  Archaic UNIX Makefile that converts files with
+                       ansi2knr (Requires ansi2knr.c from
+                       ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix      =>  AIX/gcc makefile
+ makefile.cygwin   =>  Cygwin/gcc makefile
+ makefile.darwin   =>  Darwin makefile, can use on MacosX
+ makefile.dec      =>  DEC Alpha UNIX makefile
+ makefile.freebsd  =>  FreeBSD makefile
+ makefile.hpgcc    =>  HPUX makefile using gcc
+ makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
+ makefile.hp64     =>  HPUX (10.20 and 11.00) makefile, 64-bit
+ makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.intel    =>  Intel C/C++ version 4.0 and later
+ libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
+ makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng.so.
+ makefile.ne12bsd  =>  NetBSD/cc makefile, uses PNGGCCRD,
+                       makes libpng12.so
+ makefile.openbsd  =>  OpenBSD makefile
+ makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
+ makefile.sggcc    =>  Silicon Graphics (gcc,
+                       creates libpng12.so.0.1.2.29)
+ makefile.sunos    =>  Sun makefile
+ makefile.solaris  =>  Solaris 2.X makefile (gcc,
+                       creates libpng12.so.0.1.2.29)
+ makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
+                       creates libpng12.so.0.1.2.29)
+ makefile.so9      =>  Solaris 9 makefile (gcc,
+                       creates libpng12.so.0.1.2.29)
+ makefile.32sunu   =>  Sun Ultra 32-bit makefile
+ makefile.64sunu   =>  Sun Ultra 64-bit makefile
+ makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
+ makefile.mips     =>  MIPS makefile
+ makefile.acorn    =>  Acorn makefile
+ makefile.amiga    =>  Amiga makefile
+ smakefile.ppc     =>  AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
+                       (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
+ makefile.atari    =>  Atari makefile
+ makefile.beos     =>  BEOS makefile for X86
+ makefile.bor      =>  Borland makefile (uses bcc)
+ makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
+ makefile.tc3      =>  Turbo C 3.0 makefile
+ makefile.dj2      =>  DJGPP 2 makefile
+ makefile.msc      =>  Microsoft C makefile
+ makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later
+ makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
+ pngos2.def        =>  OS/2 module definition file used by makefile.os2
+ makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
+ makevms.com       =>  VMS build script
+ descrip.mms       =>  VMS makefile for MMS or MMK
+ SCOPTIONS.ppc     =>  Used with smakefile.ppc
+
+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 pngconf.h 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".
+
+If you encounter a compiler error message complaining about the
+lines
+      __png.h__ already includes setjmp.h;
+      __dont__ include it again.;
+This means you have compiled another module that includes setjmp.h,
+which is hazardous because the two modules might not include exactly
+the same setjmp.h.  If you are sure that you know what you are doing
+and that they are exactly the same, then you can comment out or
+delete the two lines.  Better yet, use the cexcept interface
+instead, as demonstrated in contrib/visupng of the libpng distribution.
+
+Further information can be found in the README and libpng.txt
+files, in the individual makefiles, in png.h, and the manual pages
+libpng.3 and png.5.
+
+
+Using the ./configure script -- 16 December 2002.
+=================================================
+
+
+The ./configure script should work compatibly with what scripts/makefile.*
+did, however there are some options you need to add to configure explicitly,
+which previously was done semi-automatically (if you didn't edit
+scripts/makefile.* yourself, that is)
+
+
+CFLAGS="-Wall -O -funroll-loops \
+-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
+--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
+
+You can alternatively specify --includedir=/usr/include, /usr/local/include,
+/usr/include/png12, or whatever.
+
+