Can I tell MacPorts to build against its own X11 or Xorg? In this comment there is a distinction drawn between "native macOS libraries" and X11,


  Haven‘t used MacPorts for years, but most probably Kitty is compiled with the native macOS libraries, not with X11. So you need to either use an X11 version of kitty (if MacPorts has something like that), or compile it yourself with X11 support enabled. – nohillside♦ 7 hours ago 


Is it possible to target either of those within MacPorts? Or is the port package defined for just one?
No, there's no such possibility within MacPorts. This port does not come with such a choice.

kitty is based on OpenGL, and doesn't really use ordinary UI controls from a library such as GTK, QT, Aqua or similar.

kitty is a native Mac-application, as well as existing as a native Linux application. When you compile kitty on a Mac, the backend used is Cocoa (i.e. native Mac). X11 does not come into the picture at all.

You could try manually recompiling kitty and then force it to use its X11 backend. I don't think that backend has been tested on macOS though, as the author intends the user to use the native Carbon backend.