The "Enkaran home world" is the home world of the Enkarans, and was one of the few in the galaxy capable of supporting their unusual physiological needs. The Enkaran home world had no Stargate. The planet was attacked, but apparently not conquered, by the Goa'uld some time ago, and many Enkarans were taken away as slaves. At some point, SG-1 freed the Enkarans and located the only planet that suited their physiology that was reachable by Stargate.
The Gadmeer terraformer considered the Enkaran home world, but rejected it on the grounds that it was too large, had the wrong core temperature, and was already inhabited by an intelligent species. Sometime later, the terraformer selected P5S-381 for its work. Unable to halt the process, the terraformer eventually realized that it had encountered the planet's Enkaran refugee population before, and agreed to bring them back to their home world. (SG1: "Scorched Earth")