../configure --disable-multilib --enable-languages="c,c++,fortran" --prefix=/path/to/GNU --disable-static --enable-shared --with-gmp=/path/to/GMP/gmp-6.1.0 --with-mpfr=/path/to/MPFR/mpfr-3.1.4 --with-mpc=/path/to/MPC/mpc-1.0.3