wget -c http://download.osgeo.org/geos/geos-3.8.1.tar.bz2
tar -xjf geos-3.8.1.tar.bz2
cd geos-3.8.1
mkdir -p build
cd build
../configure --prefix="/usr" --enable-python  ||  ../configure --prefix="/usr"
make # Doesn't mind -j#
make install