Problème de compilation du "Kernel"

salut a tous!

je souhaite personaliser mon kernel avec make xconfig, tout est installer mais quand je le lance j'ai ca qui apparait!

CHECK qt
* Unable to find the QT4 tool qmake. Trying to use QT3
*
* Unable to find any QT installation. Please make sure that
* the QT4 or QT3 development package is correctly installed and
* either qmake can be found or install pkg-config or set
* the QTDIR environment variable to the correct location.
*
make[1]: *** No rule to make target 'scripts/kconfig/.tmp_qtcheck', needed by 'scripts/kconfig/qconf.o'. Stop.
make: *** [xconfig] Error 2