wcscoll_l(). Illumos fixed this while grabbing back our patches: https://www.illumos.org/rb/r/402/ This does not 100% fix what postgresql folks reported as there is still a remaining issue: https://www.illumos.org/issues/7962, it improves the situation The initial issue was reported in postgresql mailing lists: https://www.postgresql.org/message-id/flat/111D0E27-A8F3-4A84-A4E0-B0FB703863DF@s24.com#111D0E27-A8F3-4A84-A4E0-B0FB703863DF@s24.com Submitted by: Yuri Pankov <yuri.pankov@nexenta.com> Obtained from: Illumos MFC after: 2 weeks