hi: I have a problem when installing ns in redhat linux 6.0. after I run ./install, I get message about tk8.0.4 configure: can not find file: Xproto.h Xresources.h I find them myself, but can not find them anywhere in system too. and I download new tk8.0.4 but still have not the two files. Is there some problem in my installing or my system. please give me some advise, thanks yangmc