I am not sure this is a good way to do it. Maybe a trivial patch to configure.ac to replace cups_serverbin=`$PKG_CONFIG cups --variable=cups_serverbin` with cups_serverbin=/usr/lib/cups would be more straightforward. And we're calling autoreconf anyway.

@acho, @joeyli, @seife: review reminder

imho I would prefer a patch to configure.ac rather than sed'ing things in generated files. could you please submit that accordingly?