1
2Installing libpng version 1.2.46 - July 9, 2011
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.  If you run 'libtoolize --force', though, this will replace
17the distributed, patched, version of ltmain.sh with an unpatched version
18and your shared library builds may fail to produce libraries with the
19correct version numbers.
20
21Instead, you can use one of the custom-built makefiles in the
22"scripts" directory
23
24    cp scripts/makefile.system makefile
25    make test
26    make install
27
28The files that are presently available in the scripts directory
29are listed and described in scripts/README.txt.
30
31Or you can use one of the "projects" in the "projects" directory.
32
33Before installing libpng, you must first install zlib, if it
34is not already on your system.  zlib can usually be found
35wherever you got libpng.  zlib can be placed in another directory,
36at the same level as libpng.
37
38If you want to use "cmake" (see www.cmake.org), type
39
40   cmake . -DCMAKE_INSTALL_PREFIX=/path
41   make
42   make install
43
44If your system already has a preinstalled zlib you will still need
45to have access to the zlib.h and zconf.h include files that
46correspond to the version of zlib that's installed.
47
48You can rename the directories that you downloaded (they
49might be called "libpng-1.2.46" or "libpng12" and "zlib-1.2.3"
50or "zlib123") so that you have directories called "zlib" and "libpng".
51
52Your directory structure should look like this:
53
54   ..       (the parent directory)
55      libpng  (this directory)
56          INSTALL (this file)
57          README
58          *.h
59          *.c
60          CMakeLists.txt    =>  "cmake" script
61          configuration files:
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
66          contrib
67             gregbook
68             pngminim
69             pngminus
70             pngsuite
71             visupng
72          projects
73             cbuilder5 (Borland)
74             visualc6 (msvc)
75             visualc71
76             xcode
77          scripts
78             makefile.*
79             *.def (module definition files)
80          pngtest.png
81          etc.
82      zlib
83          README
84          *.h
85          *.c
86          contrib
87          etc.
88
89If the line endings in the files look funny, you may wish to get the other
90distribution of libpng.  It is available in both tar.gz (UNIX style line
91endings) and zip (DOS style line endings) formats.
92
93If you are building libpng with MSVC, you can enter the
94libpng projects\visualc6 or visualc71 directory and follow the instructions
95in README.txt.
96
97Otherwise enter the zlib directory and follow the instructions in zlib/README,
98then come back here and run "configure" or choose the appropriate
99makefile.sys in the scripts directory.
100
101Copy the file (or files) that you need from the
102scripts directory into this directory, for example
103
104   MSDOS example: copy scripts\makefile.msc makefile
105   UNIX example:    cp scripts/makefile.std makefile
106
107Read the makefile to see if you need to change any source or
108target directories to match your preferences.
109
110Then read pngconf.h to see if you want to make any configuration
111changes.
112
113Then just run "make" which will create the libpng library in
114this directory and "make test" which will run a quick test that reads
115the "pngtest.png" file and writes a "pngout.png" file that should be
116identical to it.  Look for "9782 zero samples" in the output of the
117test.  For more confidence, you can run another test by typing
118"pngtest pngnow.png" and looking for "289 zero samples" in the output.
119Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
120your output with the result shown in contrib/pngsuite/README.
121
122Most of the makefiles will allow you to run "make install" to
123put the library in its final resting place (if you want to
124do that, run "make install" in the zlib directory first if necessary).
125Some also allow you to run "make test-installed" after you have
126run "make install".
127
128If you encounter a compiler error message complaining about the
129lines
130
131      __png.h__ already includes setjmp.h;
132      __dont__ include it again.;
133
134this means you have compiled another module that includes setjmp.h,
135which is hazardous because the two modules might not include exactly
136the same setjmp.h.  If you are sure that you know what you are doing
137and that they are exactly the same, then you can comment out or
138delete the two lines.  Better yet, use the cexcept interface
139instead, as demonstrated in contrib/visupng of the libpng distribution.
140
141Further information can be found in the README and libpng.txt
142files, in the individual makefiles, in png.h, and the manual pages
143libpng.3 and png.5.
144
145
146Using the ./configure script -- 16 December 2002.
147=================================================
148
149
150The ./configure script should work compatibly with what scripts/makefile.*
151did, however there are some options you need to add to configure explicitly,
152which previously was done semi-automatically (if you didn't edit
153scripts/makefile.* yourself, that is)
154
155
156CFLAGS="-Wall -O -funroll-loops \
157-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
158--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
159
160You can alternatively specify --includedir=/usr/include, /usr/local/include,
161/usr/include/png12, or whatever.
162
163
164