Install Qt4.3

I had the following error:

In file included from kernel/qpsprinter.cpp:97:
kernel/qt_x11.h:65:22: X11/Xlib.h: No such file or
directory
kernel/qt_x11.h:71:23: X11/Xutil.h: No such file or
directory
kernel/qt_x11.h:72:21: X11/Xos.h: No such file or
directory
kernel/qt_x11.h:73:23: X11/Xatom.h: No such file or
directory
kernel/qt_x11.h:84:34: X11/extensions/shape.h: No such
file or directory

Solved by following:
installed "xlibs-dev" package