[Mono-list] kernel 2.2.6

[lamyae Benabdeljalil]

i have a problem in making xconfig
i downloaded kernel-source-2.2.6, untarde it,
when i do  make xconfig, i get:
HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/split-include
  HOSTCC  scripts/basic/docproc
*
* Unable to find the QT installation. Please make sure that the
* QT development package is correctly installed and the QTDIR
* environment variable is set to the correct location.
*
make[1]: *** [scripts/kconfig/.tmp_qtcheck] Error 1
make: *** [xconfig] Error 2
lamia:/usr/src/linux#
do you have any ideas about this
thanks