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Building KDE 3.3 using Konstruct on a Mandrake 10.1 Community Edition install. Getting following error

WSXP -DQT_NO_STYLE_COMPACT -DQT_NO_STYLE_POCKETPC -I/usr/local/install/konstruct/libs/qt-x11-free/work/qt-x11-free-3.3.3/mkspecs/linux-g++ -I. -I../include -I/usr/X11R6/include -I.moc/release-shared-mt/ -o .obj/release-shared-mt/qtaddons_x11.o kernel/qtaddons_x11.cpp
In file included from kernel/qtaddons_x11.cpp:25:
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
make[6]: *** [.obj/release-shared-mt/qtaddons_x11.o] Error 1
make[6]: Leaving directory `/usr/local/install/konstruct/libs/qt-x11-free/work/qt-x11-free-3.3.3/src'

Any ideas? TIA