{port_env,
 [{"darwin", "LDFLAGS", "-framework CoreFoundation -framework CoreServices"},
  {"darwin", "CC", "clang"},
  {"darwin", "CFLAGS", "-Wno-deprecated-declarations"},
  {"freebsd", "LDFLAGS", ""},
  {"freebsd", "CC", "cc"},
  {"freebsd", "CFLAGS", ""}]
}.

{port_specs,
 [{"darwin", "priv/mac_listener", ["c_src/mac/*.c"]},
  {"freebsd", "priv/kqueue", ["c_src/bsd/*.c"]}
  ]}.