dpkg -l |grep liballegro
ii  liballegro-doc                        2:4.2.2-2                            documentation for the Allegro library
ii  liballegro4.2                         2:4.2.2-2                            portable library for cross-platform game and
ii  liballegro4.2-dev                     2:4.2.2-2                            development files for the Allegro library
ii  liballegro4.2-plugin-arts             2:4.2.2-2                            aRts audio plugin for the Allegro library
ii  liballegro4.2-plugin-esd              2:4.2.2-2                            esd audio plugin for the Allegro library
ii  liballegro4.2-plugin-jack             2:4.2.2-2                            JACK audio plugin for the Allegro library
ii  liballegro4.2-plugin-svgalib          2:4.2.2-2                            SVGAlib video plugin for the Allegro library