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They only support OSS if it's profitable for them. There is no profit to be made by open-sourcing OS/2 and open-sourcing a big closed-source commercial piece of software isn't trivial (many licensed parts, needed clean-ups to protect the corporate image, etc.) either. Also most people who actually know their way around the OS/2 source base no longer work at IBM / have retired.
I think there's no hope.