http://bugs.winehq.org/show_bug.cgi?id=5314
------- Additional Comments From mike@codeweavers.com 2006-13-06 10:26 ------- I think that version of input.h has a bug - the problematic structure should be wrapped in #ifdef __KERNEL__.
I had this problem with debian unstable, and it was fixed with an update, so perhaps try logging a bug on slackware current, or updating again as it might be fixed already.
ie. This is not a Wine bug.