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It isn't possible to bundle the application, GTK and PHP without to have to install anything? No packager have been made in this goal? To be honest I not had time to install/configure GTK/PHP to let it run, I surrender, but I'm sure everyone interested in will appreciate your work.
So, clearly we will either need to figure out how to create a library file for inclusion in PHP projects, it's a great hinderance to have to handle it this way. That's not your fault of course, it's just the project owner hasn't gotten around to it. If you know of a good tool for doing this, please let me know.