xen-unstable

[bunkertor <bunkertor@tiscali.it>]

hi all,
im trying to install xen-unstable from mercurial repository but it fails 
with a strange error:
configuration script works fine with no wierd warnings.

=================================================
header-file=libxlu_disk_l.h --outfile=libxlu_disk_l.c libxlu_disk_l.l
/bin/sh: header-file=libxlu_disk_l.h: command not found
make[3]: [libxlu_disk_l.c] Error 127 (ignored)
gcc  -O1 -fno-omit-frame-pointer -m64 -g -fno-strict-aliasing -std=gnu99 
-Wall -Wstrict-prototypes -Wdeclaration-after-statement 
-Wno-unused-but-set-variable   -D__XEN_TOOLS__ -MMD -MF 
.libxlu_disk_l.o.d  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 
-fno-optimize-sibling-calls -Werror -Wno-format-zero-length 
-Wmissing-declarations -Wno-declaration-after-statement 
-Wformat-nonliteral -I. -fPIC 
-I/usr/local/src/xen-unstable/tools/libxl/../../tools/libxc 
-I/usr/local/src/xen-unstable/tools/libxl/../../tools/include   -c -o 
libxlu_disk_l.o libxlu_disk_l.c
gcc: libxlu_disk_l.c: No such file or directory
gcc: no input files
make[3]: *** [libxlu_disk_l.o] Error 1
make[3]: Leaving directory `/usr/local/src/xen-unstable/tools/libxl'
make[2]: *** [subdir-install-libxl] Error 2
make[2]: Leaving directory `/usr/local/src/xen-unstable/tools'
make[1]: *** [subdirs-install] Error 2
make[1]: Leaving directory `/usr/local/src/xen-unstable/tools'
make: *** [install-tools] Error 2
=================================================

here's my system:
[root@xen-02 xen-unstable]# cat /proc/version
Linux version 3.2.0-rc1+ (root@xen-02) (gcc version 4.4.6 20110731 (Red 
Hat 4.4.6-3) (GCC) ) #1 SMP Tue Mar 6 13:50:09 CET 2012
[root@xen-02 xen-unstable]# cat /etc/redhat-release
CentOS release 6.2 (Final)

previous xen releases works fine.
what do i miss?
thanks for any help.