Tk port installs X11 headers

Hi, I just stumbled upon the fact that the Tk port installs X11 header like Xlib.h, this has caused me trouble when trying to compile an application that depended on some things that are declared in Apple's X11 header but not in Tk's . So why does Tk install those headers in the first place ? Is it save to delete them in the post-destroot stage ? Jann