Today I installed Yeoman 1.0.0-rc.1.1 on Mac 10.8.4., but got a Fatal error: spawn ENOENT error after Grunting a fresh Yeoman generated webapp.
Several GISs later, Java was revealed as the culprit.
Oh yeah, Java!
Oracle’s Java version 7u17 and below have been disabled by Apple on OS X. Updating to the latest release will allow Java to be run on Mac OS X.
Updating Java resolved the issue for me.
If you’re having issues with PhantomJS, check your Java.