Oh, it uses system nvtt, interesting. ActorEditor is an app and should be under some bin/ directory, probably /usr/games for Mint as that is where pyrogenesis lives, for example as pyrogenesis-actor-editor or maybe 0ad-ActorEditor or whatever the convention in Mint is, the current location means user won't be able to run it via PATH.
Anyway the RUNPATH for pyrogenesis says it should see libs in /usr/lib/games/0ad and prefer them over those found in default paths.