Bob (Better Object Builder) would be a good option perhaps. Find it here: https://github.com/IBM/ibmi-bob <https://github.com/IBM/ibmi-bob>
But your release is so old that it would probably require a lot of work to even get it to build let alone work.
There are other free build tools out there but I've not used any of them. Relationships in IBM i that can affect the build can be complex and many of the commercial tools expend a lot of energy keeping track of it all.
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