https://gmplib.org/
https://gmplib.org/manual/
cd /usr/local/src
lynx https://gmplib.org/download/gmp/gmp-6.1.2.tar.bz2
tar jxf gmp-6.1.2.tar.bz2
cd gmp-6.1.2
./configure --prefix=/usr/local/gmp
make
make install
make clean