david@voyager-lnx:/usr/src/linux$ sudo make xconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/docproc
  CHECK   qt
*
* Unable to find the QT installation. Please make sure that
* the QT development package is correctly installed and
* either install pkg-config or set the QTDIR environment
* variable to the correct location.
*
  HOSTCC  scripts/kconfig/conf.o
sed < scripts/kconfig/lkc_proto.h > scripts/kconfig/lkc_defs.h 's/P(\([^,]*\),.*/#define \1 (\*\1_p)/'
  HOSTCC  scripts/kconfig/kconfig_load.o
  HOSTCC  scripts/kconfig/kxgettext.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/lex.zconf.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
make[1]: *** No rule to make target `scripts/kconfig/.tmp_qtcheck', needed by `scripts/kconfig/qconf.o'.  Stop.
make: *** [xconfig] Error 2