About
Defender is a 1981 horizontally scrolling shooter developed by Williams Electronics and released in Japan by Taito, in which the player defends astronauts on an unnamed planet from waves of invading aliens; it was designer Eugene Jarvis's first video game project, drawing inspiration from Space Invaders and Asteroids. Word War vi is an open-source game distributed as source code that builds on Linux, FreeBSD, macOS, and Windows; it uses PortAudio and libvorbisfile for sound, though it can also be built without audio support.
Getting started
On Linux, FreeBSD, or macOS, building is as simple as running 'make' (optionally without audio support via a build flag); Windows users need MinGW and Code::Blocks along with precompiled GTK, Vorbis/Ogg, and PortAudio libraries, as detailed in the project's own hacking notes.