wow, an error message that's actually informational! it sounds like poser's mac python installation doesn't include building tkinter (which is a commonly used graphical user interface for python), and in fact tcl/tk doesn't seem to be there (which is a scripting language and an interface kit). i don't know much about the mac, but it is probably possible to build that separately, or to even get binaries, since it is such a standard piece of software. which mac operating system are you using? how much do you know about dealing with the OS?