sudo port install gnuradio +grc +python27 +uhd +orc +swig
and everything seems to work fine, including gnuradio-companion (which I lost in Mac OS for ages). Thanks Michael for this great job!
Just a question: when I ran volk_profile, I notice that only generic and some orc implementations are available, with lots of 'no architectures to test'. Does someone has achieved to use sse3 implementations in Mac OS?