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libvirt to build against the older xen interface (via xend) but not 
against the newer libxl interface, so at the moment you would have to 
disable the libxl driver to get libvirt to build against 4.2.

Do you know if the libxl interface is used at the moment? If it is I think 
we probably ought to stick with xen 4.1 in Fedora 18 unless we know the 
libxl fixes are coming soon, though it may be worth updating rawhide to 
xen 4.2.

Incidentally I don't think the older xen interface has changed 
significantly between xen 4.1 and xen 4.2, so I expect libvirt compiled 
against xen 4.1 will still work against xen 4.2.

 	Michael Young