Precompiled build tool (Linux only) provided by the dev of the port himself: http://achurch.org/AquariaPSPBuilder-1.6.678.tar.gz To get the assets to convert to the PSP, you need a legal copy of the game, which can be obtained from: https://www.gog.com/game/aquaria http://www.bit-blot.com/aquaria/buy.html https://store.steampowered.com/app/24420/Aquaria/ The port doesn't seem to work in emulators, but it does work in the PSP and the PS Vita.

The readme politely informs you that this will only work on PSPs 2000 and up due to memory requirements.