  We consider examples of D=4 string theory vacua which, although globally
non-geometric, admit a local description in terms of D=10 supergravity
backgrounds. We analyze such backgrounds and find that the supersymmetry
spinors vary non-trivially along the internal manifold, reproducing the
interpolating supergravity solutions found by Frey and Grana. Finally, we
propose a simple, local expression for non-geometric fluxes in terms of the
internal spinors of the compactification.
