If you're subscribed into Optional channel (and maybe some other channel 
too) in RHN you should be able to download and install them using yum, i.e.
# yum
 install texi2html dev86 pciutils-devel iasl
command. After that you should be able to recompile. In RHEL-6 
environment you can always try either to google for the package or, 
better, use `yum install` command to install the dependencies required.
Michal
On 11/23/2010 01:24 PM, Boris Derzhavets wrote:
> In meantime :-
>
> [root@Server6RH SPECS]# rpmbuild -bb ./xen.spec
> error: Failed build dependencies:
>     texi2html is needed by xen-4.0.1-6.el6.x86_64
>     dev86 is needed by xen-4.0.1-6.el6.x86_64
>     pciutils-devel is needed by xen-4.0.1-6.el6.x86_64
>     iasl is needed by xen-4.0.1-6.el6.x86_64
>
>
> Boris.
>
>
>
> _______________________________________________
> Xen-devel mailing list
> 
Xen-devel@xxxxxxxxxxxxxxxxxxx> 
http://lists.xensource.com/xen-devel-- 
Michal Novotny<
minovotn@xxxxxxxxxx>, RHCE
Virtualization Team (xen userspace), Red Hat
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