The install appears hung on a command like this:

```
/Applications/Xcode.app/Contents/Developer/usr/bin/xcrun lipo -info /Users/mperham/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/zookeeper-1.4.7/ext/zkc-3.4.5/c/./.libs/libhashtable.a | grep -E Architectures
```