gmp:./configure --prefix=/opt/gcc-deps/gmp-6.1.0 && make -j$(nproc) && make install
mpfr:./configure --prefix=/opt/gcc-deps/mpfr-3.1.6 --with-gmp=/opt/gcc-deps/gmp-6.1.0 && make -j$(nproc) && make install
mpc:./configure --prefix=/opt/gcc-deps/mpc-1.0.3 --with-gmp=/opt/gcc-deps/gmp-6.1.0 --with-mpfr=/opt/gcc-deps/mpfr-3.1.6 && make -j$(nproc) && make install
isl:./configure --prefix=/opt/gcc-deps/isl-0.18 --with-gmp-prefix=/opt/gcc-deps/gmp-6.1.0 && make -j$(nproc) && make install