Trying to pip install grpcio-tools on a FreeBSD 10.3-STABLE system and seeing this error:

python/grpcio -Iinclude -I. -Ithird_party/boringssl/include -Ithird_party/zlib -I/usr/local/include/python2.7 -c src/core/lib/tsi/ssl_tr
p.freebsd-10.3-STABLE-amd64-2.7/src/core/lib/tsi/ssl_transport_security.o -pthread -std=gnu99
src/core/lib/tsi/ssl_transport_security.c:350:14: error: use of undeclared identifier 'AF_INET'
af = AF_INET;
^
src/core/lib/tsi/ssl_transport_security.c:352:14: error: use of undeclared identifier 'AF_INET6'
af = AF_INET6;
^
2 errors generated.

Any thoughts on a resolution or workaround?