Question: how to install plv8 on linux?
Answer: Extract plv8. zip and cd into it.
sudo apt-get install subversion.
sudo make static.
Copy plv8.so to /usr/lib/postgres/9.1/lib.
Copy plv8--(version).sql and plv8.control to /usr/share/postgres/9.1/extension.
psql -d dbName.
CREATE EXTENSION plv8;
Repeat 6-8 for plls (livescript) and plcoffee (coffeescript) if required.