The semantics of 'xfer_align' in Alsa were changed (essentially, removed) from Alsa version 1.0.16 onwards, and the function marked 'Deprecated'. This results in a build warning on all more recent Alsa versions, and the function is anyway a 'noop' stub.

To maintain backwards compatibility the call cannot simply be removed from pa_linux_alsa, as Ecasound devels found out, but needs to be called with the older Alsa versions.

See http://permalink.gmane.org/gmane.linux.alsa.devel/67752 for Ecasound notes.