ursa does not install properly

[dominictarr]

used in https://github.com/substack/cipherhub

[dominictarr]

looks like something to do with compiling.

module.js:340
    throw err;
          ^
Error: Cannot find module '../bin/ursaNative'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/home/dominic/.npmd/lib/node_modules/cipherhub/node_modules/rsa-stream/node_modules/ursa/lib/ursa.js:18:18)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)