Installing libpng version 1.2.16 - January 31, 2007On Unix/Linux and similar systems, you can simply type    ./configure [--prefix=/path]    make check    make installand ignore the rest of this document.If configure does not work on your system and you have a reasonablyup-to-date set of tools, running ./autogen.sh before running ./configuremay fix the problem.  You can also run the individual commands inautogen.sh with the --force option, if supported by your version ofthe tools.  If you run 'libtoolize --force', though, this will replacethe distributed, patched, version of ltmain.sh with an unpatched versionand your shared library builds may fail to produce libraries with thecorrect version numbers.Instead, you can use one of the custom-built makefiles in the"scripts" directory    cp scripts/makefile.system makefile    make test    make installOr you can use one of the "projects" in the "projects" directory.If you want to use "cmake" (see www.cmake.org), copy CMakeLists.txtfrom the "scripts" directory to this directory and type   cmake . [-DPNG_MMX=YES] -DCMAKE_INSTALL_PREFIX=/path   make   make installBefore installing libpng, you must first install zlib, if itis not already on your system.  zlib can usually be foundwherever 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 needto have access to the zlib.h and zconf.h include files thatcorrespond to the version of zlib that's installed.You can rename the directories that you downloaded (theymight be called "libpng-1.2.16" 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 otherdistribution of libpng.  It is available in both tar.gz (UNIX style lineendings) and zip (DOS style line endings) formats.If you are building libpng with MSVC, you can enter thelibpng projects\visualc6 directory and follow the instructions inprojects\visualc6\README.txt.You can build libpng for WindowsCE by downloading and installingthe projects\wince directory as instructed in the projects\wince.txt file, andthen following the instructions in the README* files.  Similarly, you canbuild libpng for Netware or Beos as instructed in projects\netware.txtor projects\beos.Else enter the zlib directory and follow the instructions in zlib/README,then come back here and run "configure" or choose the appropriatemakefile.sys in the scripts directory.The files that are presently available in the scripts directoryinclude 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.0.1.2.16) makefile.linux    =>  Linux/ELF makefile                       (gcc, creates libpng12.so.0.1.2.16) makefile.gcmmx    =>  Linux/ELF makefile                       (gcc, creates libpng12.so.0.1.2.16,                       uses assembler code tuned for Intel MMX platform) makefile.nommx    =>  Linux/ELF makefile                       (gcc, creates libpng12.so.0.1.2.16                       does not use Intel MMX assembler code) 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.0.1.2.16) makefile.sunos    =>  Sun makefile makefile.solaris  =>  Solaris 2.X makefile (gcc,                       creates libpng12.so.0.1.2.16) makefile.so9      =>  Solaris 9 makefile (gcc,                       creates libpng12.so.0.1.2.16) 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.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses                       assembler code tuned for Intel MMX platform) makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does                       not use assembler code) 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.ppcCopy the file (or files) that you need from thescripts directory into this directory, for example   MSDOS example: copy scripts\makefile.msc makefile   UNIX example:    cp scripts/makefile.std makefileRead the makefile to see if you need to change any source ortarget directories to match your preferences.Then read pngconf.h to see if you want to make any configurationchanges.Then just run "make" which will create the libpng library inthis directory and "make test" which will run a quick test that readsthe "pngtest.png" file and writes a "pngout.png" file that should beidentical to it.  Look for "9782 zero samples" in the output of thetest.  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 compareyour output with the result shown in contrib/pngsuite/README.Most of the makefiles will allow you to run "make install" toput the library in its final resting place (if you want todo that, run "make install" in the zlib directory first if necessary).Some also allow you to run "make test-installed" after you haverun "make install".If you encounter a compiler error message complaining about thelines      __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 exactlythe same setjmp.h.  If you are sure that you know what you are doingand that they are exactly the same, then you can comment out ordelete the two lines.  Better yet, use the cexcept interfaceinstead, as demonstrated in contrib/visupng of the libpng distribution.Further information can be found in the README and libpng.txtfiles, in the individual makefiles, in png.h, and the manual pageslibpng.3 and png.5.