[libvirt] Magic error introduced by commit f09accc

Hi all, After commit f09accc (buf: add virBufferVasprintf) libvirt no longer compiles with -Werror because of the following error: CC libvirt_util_la-macvtap.lo cc1: warnings being treated as errors /usr/include/netlink/object.h:58: error: inline function 'nl_object_priv' declared but never defined I must admit I don't understand why including stdarg.h (which seems to be the only change visible in macvtap.c) results in this warning. Does anyone have an idea? Jirka