Std::atomic no such type (raspbian-7)

hi.

i came across this on a rpi-2 with raspbian-7 installed and oF-0.9.0 nightly from 18.sept:

when using:

#if __cplusplus>=201103
    std::atomic<bool> isRunning;
#endif

the compiler complains:

'atomic' in namespace 'std' does not name a type

atomic is part of c++11.
whats wrong?

cheers
io