[libvirt] Reconfiguring doesn't trigger regeneration of libvirt.syms

Consider this sequence of commands $ ./configure ... $ make ... GEN libvirt.syms ... $ ./configure --with-driver-modules ... $ make ... libvirt.syms doesn't get regenerated but it should as it should contain virDriverLoadModule now. make clean after a configure run doesn't help, as make clean dosen't remove libvirt.syms. So either the libvirt.syms rule needs to depend on something that triggers a regeneration of libvirt.syms after a reconfiguration or make clean needs to remove libvirt.syms. I'm not sure about the correct solution here. Any suggestions? Matthias