I'm trying to install Perl Tk version 800.024 but I'm having issues. I'm receiving the following error:

Using -L/usr/X11R6/lib to find /usr/X11R6/lib/libX11.so.6.2
Cannot find X include files via /usr/X11R6/include
Cannot find X include files anywhere at ./myConfig line 312.
Compilation failed in require at Makefile.PL line 17.
BEGIN failed--compilation aborted at Makefile.PL line 19.

I'm running Red Hat 9.0. I search for X11.so.6.2, but couldn't find it. The folder /usr/X11R6/include exists, but I don't know what's meant to be inside that folder. I'm worried I might need something additional installed. I would greatly appreciate any help.

not sure about x11.so.6.2 (try searching for just libX11.so and seeing what that provides etc...) but you'll mainly be needed XFree86-devel, that's what will put the stuff in to include/

Ok, I've ruled out the libX11.so file. I think the error solely relates to the missing include files. Does any one know what this error message relates too?