It's a fair point! I'll ask about it.
Rktcr's version of SDL doesn't support pulse audio.
So setting the environment variable SDL_AUDIODRIVER to "pulseaudio" (which appears to have been done on your system) will cause this failure.
(FWIW, I run Debian sid, and use recent libstdc++ because Rktcr requires c++11 features. Be glad you aren't on OSX 10.6, and just not supported at all.)
Unfortunately, it's 10.7+ only; I blame Apple's poor backward compatibility with libc++ and/or my enjoyment of C++11 features not available in earlier compilers.
tchow
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