node.bcrypt.js: node-gyp: Permission denied

I can’t install the latest, 0.7.5, on my ubuntu server. This is giving me strong deja vu. I think I’ve seen this on other modules and maybe on bcrypt before. I don’t remember how I got past it. Maybe the problem has to do with installing while logged in as root? Here is the error:

$ npm install bcrypt
npm http GET https://registry.npmjs.org/bcrypt
npm http 304 https://registry.npmjs.org/bcrypt
npm http GET https://registry.npmjs.org/bindings/1.0.0
npm http 304 https://registry.npmjs.org/bindings/1.0.0

> bcrypt@0.7.5 install /ri/node_modules/bcrypt
> node-gyp rebuild

sh: 1: node-gyp: Permission denied
npm ERR! bcrypt@0.7.5 install: `node-gyp rebuild`
npm ERR! `sh "-c" "node-gyp rebuild"` failed with 127
npm ERR!
npm ERR! Failed at the bcrypt@0.7.5 install script.
npm ERR! This is most likely a problem with the bcrypt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-gyp rebuild
npm ERR! You can get their info via:
npm ERR!     npm owner ls bcrypt
npm ERR! There is likely additional logging output above.

npm ERR! System Linux 3.2.0-31-virtual
npm ERR! command "/root/.nvm/v0.10.0/bin/node" "/root/.nvm/v0.10.0/bin/npm" "install" "bcrypt"
npm ERR! cwd /ri
npm ERR! node -v v0.10.0
npm ERR! npm -v 1.2.14
npm ERR! code ELIFECYCLE
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     /ri/npm-debug.log
npm ERR! not ok code 0