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wget http://download.osgeo.org/geos/geos-3.3.6.tar.bz2
tar xvfj geos-3.3.6.tar.bz2
cd geos-3.3.6
./configure
make
sudo make install
cd ..


fuente: http://trac.osgeo.org/postgis/wiki/UsersWikiPostGIS20Ubuntu1110src