Gifsicle for Cygwin

"Gifsicle is a UNIX command-line tool for creating, editing, and getting information about GIF images and animations."

Here's how I installed it in Cygwin:

1. Have a good look at gifsicle site. There may be changes.
2. Download latest source file (e.g. gifsicle-1.44.tar.gz)
3. Do the following

cd /usr/local/src #create the directory if it is not there!
tar -xzf gifsicle-1.44.tar.gz
cd gifsicle-1.44
CFLAGS="-O2 -mtune=i686 -Wall -I/usr/local/src/gifsicle-1.44 \
-I/usr/local/src/gifsicle-1.44/include " ./configure \
--disable-gifview --disable-gifdiff
make 
make install #will install gifsicle command in /usr/local/bin
#man gifsicle will give help.