Gaming Linux® From Scratch (System V Edition) - Version #8ada

Chapter 6. Basic X11 Software

libpng-1.6.50

Introduction to libpng

The libpng package contains libraries used by other programs for reading and writing PNG files. The PNG format was designed as a replacement for GIF and, to a lesser extent, TIFF, with many improvements and extensions and lack of patent problems.

Additional Downloads

Installation of libpng

If you want to patch libpng to support apng files, apply it here: 

gzip -cd ../libpng-1.6.47-apng.patch.gz | patch -p1

Install libpng by running the following commands: 

./configure --prefix=/usr --disable-static &&
make

To test the results, issue: make check.

Now, as the root user: 

make install &&
mkdir -v /usr/share/doc/libpng-1.6.50 &&
cp -v README libpng-manual.txt /usr/share/doc/libpng-1.6.50

lib32 Installation of libpng

Install lib32-libpng by running the following commands: 

make distclean &&
CC="gcc -m32" CXX="g++ -m32"         \
PKG_CONFIG_PATH=/usr/lib32/pkgconfig \
./configure --prefix=/usr            \
            --libdir=/usr/lib32      \
            --host=i686-pc-linux-gnu \
            --disable-static &&

make

Now, as the root user: 

make DESTDIR=$PWD/DESTDIR install     &&
cp -vr DESTDIR/usr/lib32/* /usr/lib32 &&
rm -rf DESTDIR                        &&
ldconfig

Command Explanations

[Note]

Note

Run ./configure --help for a full list of options.

--disable-static: This switch prevents installation of static versions of the libraries.

Contents

Installed Programs: libpng-config (symlink), libpng16-config, pngfix, and png-fix-itxt
Installed Libraries: libpng
Installed Directories: /usr/include/libpng16 and /usr/share/doc/libpng-1.6.50

Short Descriptions

pngfix

tests, optimizes and optionally fixes the zlib header in PNG files. Optionally, when fixing, strips ancillary chunks from the file

png-fix-itxt

fixes PNG files that have an incorrect length field in the iTXt chunks

libpng-config

is a shell script that provides configuration information for applications wanting to use libpng

libpng

contain routines used to create and manipulate PNG format graphics files