Port "pll_powerdown" does not exist in macrofunction "serdes"

I'm getting the error 'Port "pll_powerdown" does not exist in macrofunction "serdes"' trying to rebuild an old Arria II GX project under Quartos 9.1 (build 350 SP2).

There is a support note http://www.altera.co.uk/support/kdb/solutions/rd04052011_141.html but that refers to a problem in Quartos 10 web edition. The link to the release notes is completely unhelpful - wrong version.

I suspect that our last release was built using a very slightly earlier version of quartos, and that the qsys part wasn't regenerated after quartos was updated.

Any ideas about how to get this built?