Imager::File::GIF provides GIF file format support for Imager. It requires libgif to be installed, including development headers. For Linux distributions this typically requires installation of the associated -dev or -devel package. See Imager::Install for more information. Imager::File::GIF is currently shipped as part of Imager, but Imager may install with out installing Imager::File::GIF, so if you need GIF support, add a dependency on Imager::File::GIF. Makefile.PL will reject libgif 4.2.0 and 5.0.0 due to bugs in those releases.