Beyond Linux® From Scratch (systemd Edition) - Version r12.0-816

Chapter 10. Graphics and Font Libraries

libpng-1.6.40

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.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

Additional Downloads

Installation of libpng

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

gzip -cd ../libpng-1.6.40-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-1.6.40 &&
cp -v README libpng-manual.txt /usr/share/doc/libpng-1.6.40

Command Explanations

--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.so
Installed Directories: /usr/include/libpng16 and /usr/share/doc/libpng-1.6.40

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.so

contain routines used to create and manipulate PNG format graphics files