./configure --with-gmp-include=/opt/build/gmp-4.2.1 --with-gmp-lib=/opt/build/gmp-4.2.1/.libs --with-mpfr-include=/opt/build/mpfr-2.2.1 --with-mpfr-lib=/opt/build/mpfr-2.2.1/.libs
./configure --with-gmp-include=/opt/build/gmp-4.2.1 --with-gmp-lib=/opt/build/gmp-4.2.1/.libs --with-mpfr-include=/opt/build/mpfr-2.2.1 --with-mpfr-lib=/opt/build/mpfr-2.2.1/.libs