ObjGTKGen is a utility that generates Objective-C language bindings for ObjGTK using GObject Introspection (parsing GIR files). ObjGTKGen is free software, licensed under the GNU LGPL.
The ObjGTK code base is compatible with the Objective C dialect of GCC ("Objective C 2.0") as introduced as of Mac OS X 10.5. So there is no need to use clang. There are plans to create a branch that delivers advanced support of clang language features, especially memory management via Automatic Reference Counting (ARC).
This is an untested preview release of ObjGTK. Take care when using. See milestones for the further release plan.