2 Installing libpng version 1.2.51 - February 6, 2014
4 On Unix/Linux and similar systems, you can simply type
6 ./configure [--prefix=/path]
10 and ignore the rest of this document.
12 If configure does not work on your system and you have a reasonably
13 up-to-date set of tools, running ./autogen.sh before running ./configure
14 may fix the problem. You can also run the individual commands in
15 autogen.sh with the --force option, if supported by your version of
16 the tools. If you run 'libtoolize --force', though, this will replace
17 the distributed, patched, version of ltmain.sh with an unpatched version
18 and your shared library builds may fail to produce libraries with the
19 correct version numbers.
21 Instead, you can use one of the custom-built makefiles in the
24 cp scripts/makefile.system makefile
28 The files that are presently available in the scripts directory
29 are listed and described in scripts/README.txt.
31 Or you can use one of the "projects" in the "projects" directory.
33 Before installing libpng, you must first install zlib, if it
34 is not already on your system. zlib can usually be found
35 wherever you got libpng. zlib can be placed in another directory,
36 at the same level as libpng.
38 If you want to use "cmake" (see www.cmake.org), type
40 cmake . -DCMAKE_INSTALL_PREFIX=/path
44 If your system already has a preinstalled zlib you will still need
45 to have access to the zlib.h and zconf.h include files that
46 correspond to the version of zlib that's installed.
48 You can rename the directories that you downloaded (they
49 might be called "libpng-1.2.51" or "libpng12" and "zlib-1.2.3"
50 or "zlib123") so that you have directories called "zlib" and "libpng".
52 Your directory structure should look like this:
54 .. (the parent directory)
55 libpng (this directory)
60 CMakeLists.txt => "cmake" script
62 configure.ac, configure, Makefile.am, Makefile.in,
63 autogen.sh, config.guess, ltmain.sh, missing,
64 aclocal.m4, config.h.in, config.sub,
65 depcomp, install-sh, mkinstalldirs, test-pngtest.sh
79 *.def (module definition files)
89 If the line endings in the files look funny, you may wish to get the other
90 distribution of libpng. It is available in both tar.gz (UNIX style line
91 endings) and zip (DOS style line endings) formats.
93 If you are building libpng with MSVC, you can enter the
94 libpng projects\visualc6 or visualc71 directory and follow the instructions
97 Otherwise enter the zlib directory and follow the instructions in zlib/README,
98 then come back here and run "configure" or choose the appropriate
99 makefile.sys in the scripts directory.
101 Copy the file (or files) that you need from the
102 scripts directory into this directory, for example
104 MSDOS example: copy scripts\makefile.msc makefile
105 UNIX example: cp scripts/makefile.std makefile
107 Read the makefile to see if you need to change any source or
108 target directories to match your preferences.
110 Then read pngconf.h to see if you want to make any configuration
113 Then just run "make" which will create the libpng library in
114 this directory and "make test" which will run a quick test that reads
115 the "pngtest.png" file and writes a "pngout.png" file that should be
116 identical to it. Look for "9782 zero samples" in the output of the
117 test. For more confidence, you can run another test by typing
118 "pngtest pngnow.png" and looking for "289 zero samples" in the output.
119 Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
120 your output with the result shown in contrib/pngsuite/README.
122 Most of the makefiles will allow you to run "make install" to
123 put the library in its final resting place (if you want to
124 do that, run "make install" in the zlib directory first if necessary).
125 Some also allow you to run "make test-installed" after you have
128 If you encounter a compiler error message complaining about the
131 __png.h__ already includes setjmp.h;
132 __dont__ include it again.;
134 this means you have compiled another module that includes setjmp.h,
135 which is hazardous because the two modules might not include exactly
136 the same setjmp.h. If you are sure that you know what you are doing
137 and that they are exactly the same, then you can comment out or
138 delete the two lines. Better yet, use the cexcept interface
139 instead, as demonstrated in contrib/visupng of the libpng distribution.
141 Further information can be found in the README and libpng.txt
142 files, in the individual makefiles, in png.h, and the manual pages
146 Using the ./configure script -- 16 December 2002.
147 =================================================
150 The ./configure script should work compatibly with what scripts/makefile.*
151 did, however there are some options you need to add to configure explicitly,
152 which previously was done semi-automatically (if you didn't edit
153 scripts/makefile.* yourself, that is)
156 CFLAGS="-Wall -O -funroll-loops \
157 -malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
158 --with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
160 You can alternatively specify --includedir=/usr/include, /usr/local/include,
161 /usr/include/png12, or whatever.