boost-libs build failure on amd64-9.99.17

["John D. Baker" <jdbaker%consolidated.net@localhost>]

Building devel/boost-libs on NetBSD/amd64-9.99.17 fails with:

[...]
gcc.compile.c++ bin.v2/libs/log/build/gcc-7.4.0/release/link-static/threadapi-pthread/threading-multi/visibility-hidden/syslog_backend.o
In file included from /usr/include/stddef.h:37:0,
                 from /usr/include/g++/cstddef:50,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/log/detail/config.hpp:34,
                 from libs/log/src/syslog_backend.cpp:18:
./boost/asio/detail/impl/kqueue_reactor.ipp: In constructor 'boost::asio::detail::kqueue_reactor::kqueue_reactor(boost::asio::execution_context&)':
./boost/asio/detail/impl/kqueue_reactor.ipp:32:5: error: invalid static_cast from type 'intptr_t {aka long int}' to type 'void*'
     EV_SET(ev, ident, filt, flags, fflags, data, \
     ^
[...]

in several places.

I seem to recall something about the EV_SET() macro being changed at some
point.  I noticed a patch for "security/sudo" that provides an alternate
EV_SET() macro definition for NetBSD versions before 9.99.14.

Is something like that at play here?

-- 
|/"\ John D. Baker, KN5UKS               NetBSD     Darwin/MacOS X
|\ / jdbaker[snail]consolidated[flyspeck]net  OpenBSD            FreeBSD
| X  No HTML/proprietary data in email.   BSD just sits there and works!
|/ \ GPGkeyID:  D703 4A7E 479F 63F8 D3F4  BD99 9572 8F23 E4AD 1645