As per this reddit post (https://rl.bloat.cat/r/openbsd_gaming/comments/1gsoe0u/support_minecraft_1213/) you cannot play newer Minecraft versions on OpenBSD. However it looks like a very easy fix and I made some changes to the source, but I can't compile it because it can't find Qt5CoreConfig.cmake/qt5core-config.cmake Is one of the mantainers able to fix it?
-- Thanks Jesse Lawton
