daxtsu has ported Wii Vectrex emulator "VecxWii" to the GameCube, it's a basic port which doesn't address any of the bugs the Wii version has, but a new emulator port for the GameCube nonetheless
Changelog:
-Ported to Gamecube
-Added preprocessor checks to determine if we're compiling for Wii or GC(to remove Wiimote/USB specific code)
-Compiled with GRRLIB 4.3.2 and DevkitPro r26
Download/Discuss it here