Beyond Linux® From Scratch (System V Edition) - Version r12.4-426

Chapter 10. Graphics and Font Libraries

giflib-5.2.2

Introduction to giflib

The giflib package contains libraries for reading and writing GIFs as well as programs for converting and working with GIF files.

[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

giflib Dependencies

Optional

xmlto-0.0.29 (required if you run make after make clean) [1]

Installation of giflib

First, prevent the build process from installing XML files instead of man pages: 

patch -Np1 -i ../giflib-5.2.2-upstream_fixes-1.patch

Next, fix several security vulnerabilities in the 'gif2rgb' utility: 

patch -Np1 -i ../giflib-5.2.2-security_fixes-1.patch

Next, remove an unnecessary dependency on ImageMagick-7.1.2-1 by moving a file into an expected location: 

cp pic/gifgrid.gif doc/giflib-logo.gif

Install giflib by running the following commands: 

make

To test the results, issue: make check.

Now, as the root user: 

make PREFIX=/usr install &&

rm -fv /usr/lib/libgif.a &&

find doc \( -name Makefile\* -o -name \*.1 \
         -o -name \*.xml \) -exec rm -v {} \; &&

install -v -dm755 /usr/share/doc/giflib-5.2.2 &&
cp -v -R doc/* /usr/share/doc/giflib-5.2.2

Command Explanations

rm -fv /usr/lib/libgif.a: This command removes a static library which is not used by any BLFS package.

find doc ... -exec rm -v {} \;: This command removes Makefiles, man and xml files from the documentation directory that would otherwise be installed by the commands that follow.

Contents

Installed Programs: gif2rgb, gifbuild, gifclrmp, giffix, giftext, and giftool
Installed Library: libgif.so
Installed Directory: /usr/share/doc/giflib-5.2.2

Short Descriptions

gif2rgb

converts images saved as GIF to 24-bit RGB images

gifbuild

dumps GIF data in a textual format, or undumps it to a GIF

gifclrmp

modifies GIF image colormaps

giffix

clumsily attempts to fix truncated GIF images

giftext

prints (text only) general information about a GIF file

giftool

is a GIF transformation tool

libgif.so

contains API functions required by the giflib programs and any other programs needing library functionality to read, write and manipulate GIF images


[1] Pre-built documentation is present in this tarball. make will detect that documentation already exists in the distribution if make clean was not run, and will not require the xmlto-0.0.29 dependency. However, running make clean will result in the pre-built documentation being deleted, thus requiring xmlto to build the documentation if make is run afterwards.