The libungif package contains a shared library of functions for loading and saving GIF format image files. The libungif library can load any GIF file, but it will save GIFs only in uncompressed format (i.e., it won't use the patented LZW compression used to save "normal" compressed GIF files).
Install the libungif package if you need to manipulate GIF files. You should also install the libungif-progs package.
Note: As the LZW patent has expired you should now use the giflib library instead which can also save compressed GIF files.
The library is available as 32-bit and 64-bit:
Current version: v4.1.4