gnurobbo (a FOSS implementation of a Polish Atari XE game) GNU Robbo is a free and open source implementation of Janusz Pelc's Robbo for the Atari 8-bit computers, which was distributed by LK Avalon in 1989. This script will build without support for TrueType fonts by default. Export TTFONTS=yes in the environment to enable TrueType, which links against SDL_ttf and also changes the appearance of the in-game text. The default text is more blocky and "retro".