Third-party libraries are stored here. Currently, we use Shapely,
lp_solve (along with its Python bindings), and env-js. To install
them, simply run 'make' within this directory. You can also run 'make
lib' in the top-level directory.

You will need GEOS installed for Shapely to work properly.

Env-js requires a Java runtime, and the Ant utility, at least.