ppc cross-compile breaks in nspr > 4.8.4?

I'm new to the list and to nspr, so I apologize if I get something wrong 
here.

I am cross-compiling nspr for a PPC architecture.  For all versions of NSPR 
<= 4.8.4 it works and I can execute the test applications such as 
`provider`.  For NSPR > 4.8.4 the build works but `provider` and all other 
apps consistently fail with "Illegal instruction".  I'm in a very minimal 
embedded environment, so I don't have any debug other than that - sorry.

Regards,

Simon Knee.