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I would like to do Gutenprint development via Xcode. If anyone could give any tips or hints on how to set up the project, it would be a big help!
I am not a coder, so I can't give you specific directions. I did find some information on the general topic in the Developer section at Apple
If you are doing development that would benefit all Gutenprint users, you might like to join the developer's mailing list at https://lists.sourceforge.net/lists/listinfo/gimp-print-devel. Contributions are always welcome.