http://bugs.winehq.org/show_bug.cgi?id=59079
--- Comment #1 from actium@gmx.net --- This is related to, but not a duplicate of https://bugs.winehq.org/show_bug.cgi?id=58751 (thanks to Chiitoo for pointing this out). I've read the discussion and would like to add the following argument:
AFAICT, adding ntsync.h to the Trixie packages will not break anything for non-backport Trixie installs. Wine with ntsync support will silently default to the wineserver-based sync mechanism if /dev/ntsync is missing. Thus, it would help out backport users without affecting non-backport installs.