make xconfig
  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.
 
*
make[1]: *** No rule to make target `scripts/kconfig/.tmp_qtcheck', needed by `scripts/kconfig/qconf.o'.  Stop.
make: *** 
xconfig Error 2
Later, I tried "make oldconfig" followed by "make", build logs shows vmlinuz built
...
SYSMAP System.map
  SYSMAP .tmp_System.map
  OBJCOPY arch/i386/boot/vmlinux-stripped
  GZIP    arch/i386/boot/vmlinuz
Kernel: arch/i386/boot/vmlinuz is ready  (#3)
...
however, I do not see vmlinuz under arch/i386/boot...
# pwd
/root/xenserver/linux-2.6.18-128.1.6.el5.xs5.5.0.496.1012/arch/i386/boot
# ls
Makefile    compressed  install.sh      setup.S  video.S
bootsect.S  edd.S       
mtools.conf.in  tools
# 
 Build continues after the above message with