sir, I have got a error in tk8.5.18 when make command is running. like:- tk8.5.18/unix/../generic/tk.h:80:25: fatal error: X11/Xlib.h: No such file or directory compilation terminated. make: *** [tkStubLib.o] Error 1 in ubuntu 13.04. how to fix it.please send me solution and if any package requirement send me download link. thank you.