make error:at upgrading to gcc 4.5.2(from 4.4.3)(suffix error)

[eric lin]

Dear gcc programers:

  According to article in that FAQ#configure_suffix
it point out it was caused by 
----
Common causes for this error message are:

    * required libraries for the GCC build are missing, specifically MPFR, GMP and MPC. If installed as shared libraries they must be in the runtime linker's search path so they can be found. 
----
but I already download and 
./configure
make
make install
all these said packages(library)
gmp-5.0.2  mpc-0.9  mpfr-3.0.1

before I get this make error(on suffix)

so, plz help again, and thx a lot in advance, Eric