http://bugs.winehq.org/show_bug.cgi?id=58751
--- Comment #17 from Rosanne DiMesio dimesio@earthlink.net --- The OBS updated their Testing container and the newer linux-libc-dev is now used:
[ 21s] [36/797] installing linux-libc-dev-6.16.9-1
Hopefully that's all that was needed; there are no warnings from configure about ntsync.