New Post: 'recursive_lock_t': is not a member of 'Concurrency::extensibility'

I'm trying to compile the BingRequest project with Visual Studio 14 CTP and I'm getting the following error:

error C2039: 'recursive_lock_t': is not a member of 'Concurrency::extensibility'

The typedef for recursive_lock_t is in pplwin.h, but the file (pplxwin.h) is #ifdef out.

Any suggestions?

Thanks,
Mark