I'm trying to install socket.io on centos 5 with node.js package manager. During installation I got an error: "make: node-waf: Command not found" and "This is most likely a problem with the ws package" # npm install socket.io npm http GET https://registry.npmjs.org/socket.io npm http 304 https://registry.npmjs.org/socket.io npm http GET https://registry.npmjs.org/policyfile/0.0.4 npm http GET http