So on #FreeBSD #RiverWM doesn't build so far from source at the moment like it did under #Linux . I may find the missing package that I need or get help. Or maybe I'll stick with the pre-compiled pkg ?
The error I got is:

/home/justine/Git/river/.zig-cache/o/06b1e7dc1fc49d5f70f756116958d43b/cimport.h:4:10: error: 'linux/input-event-codes.h' file not found