What configuration should be set in a custom compiled libvirt to get the most out of the xen libxl?

  [ -f Makefile ] || ./configure --prefix=/usr --libexec=/usr/lib/"$pkgname" --sbindir=/usr/bin \
--with-storage-lvm=yes --with-udev=yes --without-hal --disable-static \
--with-init-script=systemd --with-systemctl=yes --with-systemd-daemon=yes \
--with-qemu-user=nobody --with-qemu-group=nobody \
--without-netcf --with-interface --with-lxc --with-storage-iscsi \
    --with-xen=yes --with-libxl=yes 
# --with-audit
 

After compiling what needs done to configure libvirt to work with xen libxl because all I seem to be getting is:

error: failed to connect to the hypervisor
error: no connection driver available for //libxl
[dragon@archxen ~]$