Error when building Embedded T2 for Powerpc64

Hi All,
I want to build a embedded system for
powerpc64(ppc64), and got the following error when
cross-compiling gcc 4.2.3:

In file included from
../../gcc/config/rs6000/ppc64-fp.c:35:
../../gcc/config/fp-bit.h:100: error: unable to
emulate 'TF'

Someone could help me?
Lai


      
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