The problem is that it involves Objective-C which we don't use in the code at the moment...
I believe you can call Objective-C methods from C, using [the runtime](https://developer.apple.com/documentation/objectivec/objective_c_runtime).
...which then complicates build settings and requires linking objective-c runtime
Yeah, though I'm sure Geany is already indirectly linked to the Objective-C via GTK+. It's basically just adding a `-framework` flag conditionally for Macos to the build script or whatever.