EV_SET fallout (was Re: rxvt-unicode build snafu)

[Greg Troxel <gdt%lexort.com@localhost>]

Bob Bernstein <bob%fanatick.org@localhost> writes:

> In file included from ./../libev/ev_kqueue.c:42:0,
>                  from ./../libev/ev.c:2684,
>                  from ev_cpp.C:2:
> ./../libev/ev_kqueue.c: In function 'void kqueue_change(int, int, int, int)':
> ./../libev/ev_kqueue.c:52:3: error: call of overloaded '_EV_SET(kevent*, uintptr_t, int&, int&, int&, int, int)' is ambiguous
>    EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
>    ^
> /usr/include/sys/event.h:59:1: note: candidate: void _EV_SET(kevent*, uintptr_t, uint32_t, uint32_t, uint32_t, int64_t, intptr_t)
>  _EV_SET(struct kevent *_kevp, uintptr_t _ident, uint32_t _filter,
>  ^~~~~~~
> /usr/include/sys/event.h:76:1: note: candidate: void _EV_SET(kevent*, uintptr_t, uint32_t, uint32_t, uint32_t, int64_t, void*)
>  _EV_SET(struct kevent *_kevp, uintptr_t _ident, uint32_t _filter,
>  ^~~~~~~

I have been seeint EV_SET issues in a lot of places, but am unclear on
the cause and usual resolution.

Could someone who really understands the EV_SET troubles explain?