Beyond Linux From Scratch - Version 6.1

Chapter 9. Graphics and Font Libraries

Libpng-1.2.8

Introduction to Libpng

The libpng package contains libraries used by other programs for reading and writing PNG files.

Package Information

Additional Downloads

Installation of Libpng

Install libpng by running the following commands: 

patch -Np1 -i ../libpng-1.2.8-link_to_proper_libs-1.patch &&
make prefix=/usr ZLIBINC= \
    ZLIBLIB= -f scripts/makefile.linux

To test the results, issue: make -f scripts/makefile.linux test.

Now, as the root user: 

make prefix=/usr install -f scripts/makefile.linux

Command Explanations

ZLIBINC=; ZLIBLIB=: This forces libpng to look for the Zlib includes and libraries in the default locations (/usr/include and /usr/lib respectively).

-f scripts/makefile.linux: This points make at the Linux version of the Makefile as libpng doesn't use an Autoconf routine. Instead, it has various Makefiles for different platforms.

Configuring Libpng

Configuration Information

As with most libraries, there is no configuration to do, save that the library directory i.e., /opt/lib or /usr/local/lib should appear in /etc/ld.so.conf so that ldd can find the shared libraries. After checking that this is the case, /sbin/ldconfig should be run while logged in as root.

Contents

Installed Programs: libpng-config and libpng12-config
Installed Libraries: libpng.[so,a] and libpng12.[so,a]
Installed Directory: /usr/include/libpng12

Short Descriptions

libpng-config

is a symlink to libpng12-config.

libpng12-config

provides configuration information for libpng.

libpng.[so,a] and libpng12.[so,a]

are a collection of routines used to create and manipulate PNG format graphics 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.

Last updated on 2005-08-01 13:29:19 -0600