Backport #725 from trunk:
Realy fix building MPFR.

/branches/1.1/scripts/build/mpfr.sh | 2 2 0 0 ++
1 file changed, 2 insertions(+)

 # Compute x86_64-specific values

 CT_DoArchValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }