10.9 works for me using the 2.3.15 RC11 Universal build. That symbol is missing only from the 10.7 and 10.8 libc++abi.dylib
Could you test again, and give the error message?
And can we continue that conversation on github? OSX: undefined symbol on OSX 10.7-10.8, missing libc++ and libc++abi on 10.6 · Issue #431 · NatronGitHub/Natron · GitHub