in commit 4eec614 (Remove default keywords from MidiMessageSequence to be compatible with VS 2013), std::move was used to replace the keyword.
Unfortunately std::move is not present if OSX Deployment target 10.6 is used as it requires an older standard library with incomplete C++11 support. Of course JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS is still true because the compiler is new and move semantics work, just not std::move.
For OSX a workaround is to roll back just this commit - but that of course won’t work for MSVC2013. Maybe another MACRO constant would be in order… JUCE_STD_MOVE_AVAILABLE or something like that which would depend on MSVC version and OSX Deployment Target