Curse of War – a fast-paced action strategy game for Linux implemented using C and ncurses. SDL version is available since v1.2.
Unlike most RTS, you are not controlling units, but focus on high-level strategic planning: Building infrastructure, securing resources, and moving your armies. The core game mechanics turns out to be quite close to WWI-WWII type of warfare, however, there is no explicit reference to any historical period.
Curse of War 1.1.8 source code 44KB.tar.gz