Package: gifsicle

"gifsicle" package binaries on CentOS:

/usr/bin/gifdiff /usr/bin/gifsicle

You may install this package on CentOS with yum install gifsicle

"gifsicle" package binaries on Debian:

/usr/bin/gifdiff /usr/bin/gifsicle /usr/bin/gifview

You may install this package on Debian with apt-get install gifsicle