Tk seems to install fine for almost everyone else - see the Darwin test results. If make test fails on your platform you should try to determine why that is. Try running t/basic.t in isolation, determine which test fails and why. If it is something wrong with the module itself, then you should raise a bug report against the module so that this can be fixed.

You get to use all this wonderful open source software for free. It would be rude not to contribute back simply by analysing the installation problems and reporting the cause to the module authors.