Build breaks on FreeBSD: undefined reference to `handle_mmap'

In version 2.3.0:

../../src/lib/.libs/libtorsocks.so: undefined reference to `handle_mmap'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[4]: *** [Makefile:623: test_socks5] Error 1
gmake[4]: *** Waiting for unfinished jobs....
libtool: link: cc -I../../include -I../../src -I../../tests/utils/ -I. -I../../src/lib -DTORSOCKS_FIXTURE_PATH=\"/usr/ports/net/torsocks/work/torsocks-2.3.0/tests/unit/fixtures/\" -O2 -pipe -fno-omit-frame-pointer -fstack-protector -fno-strict-aliasing -Wall -fPIE -fwrapv --param ssp-buffer-size=1 -fstack-protector-all -fstack-protector -pie -z relro -z now -o .libs/test_compat test_compat.o  ../../tests/utils/tap/.libs/libtap.a ../../src/common/.libs/libcommon.a ../../src/lib/.libs/libtorsocks.so -Wl,-rpath -Wl,/usr/local/lib/torsocks
../../src/lib/.libs/libtorsocks.so: undefined reference to `handle_mmap'