https://bugs.winehq.org/show_bug.cgi?id=52217
--- Comment #10 from Alexandre Julliard julliard@winehq.org --- Solaris is pretty much unsupported at this point, there are essentially zero users, and it's not worth the extra maintenance work.
If someone really cares, they can maintain an out-of-tree patch. If that generates enough interest we can reconsider.