CentOS virt - Apr 2008 - Compiling Xen from srpm and changing build options

Is it possible to build the rpm from xen's srpm and change options such as
whether or not to enable PCI-device backend driver, or basically expose all the
options menuconfig would?

I am trying to pass a nic into a pv guest and I cant get it to work using the
other possible route using the modprobe.conf method.

Thanks,
jlc
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