CopyLeft does NOT mean NO Royalties. If a developer uses the GPLv2, GPLv3, or AGPL, they can still make you pay for it before handing you the source code. It does NOT have to be free to access, just that the source code is handed out.
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I am having issues with Knightin' on Linux. I have a ton of custom fonts installed for development purposes (Ruby and Golang dev) and the game craps the bed on launch due to Fontconfig errors, but if I move or delete the system fonts directory, it works just fine. Is there anyway to get the game to look at my user fonts directory instead or disable the check entirely?