ok, here is the error that I get:

In file included from main.cxx:35:
common.h:7:22: X11/Xlib.h: No such file or directory
common.h:8:23: X11/Xatom.h: No such file or directory
common.h:9:23: X11/Xutil.h: No such file or directory
In file included from common.h:10,

kernel/qt_x11_p.h:66:22: X11/Xlib.h: No such file or directory
kernel/qt_x11_p.h:71:23: X11/Xutil.h: No such file or directory
kernel/qt_x11_p.h:72:21: X11/Xos.h: No such file or directory
kernel/qt_x11_p.h:73:23: X11/Xatom.h: No such file or directory
it seems I am missing Xlib.h, Xatom.h, Xutil.h

here are errors I get from two different compile attempts

I would appreciate some help on how to find and or fix these files

Mandrake splits up its packages into binary and -devel packages. So if you get Xorg-6.8.1 for example,
one package will contain the things you need to run the server while Xorg-6.8.1-devel (it may be named a little different) is what you need to install the header files to compile against.

I had this problem today, so I make t download of this file from XfreeOrg
ftp://ftp.xfree86.org/pub/XFree86/4..../X430src-1.tgz

then I unpacked it and made a copy of the missing files as it was asking on /usr/X11R6/include/X11.

So I go on with Qt installation. I am using Kurumin Linux (based on Debian)

You'll then want the *.deb package... a *.TGZ is a slackpack, a binary package for Slackware.