opusfile-0.6 does not compile on MacOSX 10.5.8: AI_NUMERICSERV
On older systems such as MacOSX 10.5.8, the AI_NUMERICSERV is not defined and so src/http.c fails to compile:
The culprit is
#if !defined(_WIN32)
hints.ai_flags=AI_NUMERICSERV;
#endif
The simplest remedy seems to be to check for
#if defined(AI_NUMERICSERV)
instead.