Get pow running with ZSH and Rbenv

Posted by Alexander Ross on 02 March 2014

Usually I'm using rails s with thin or webbrick when developing web applications because I've had lots of issues with pow and file uploads. But when I'm working on multiply projects within same day it's really handy to have pow installed.

Hey wait, what is pow? Pow is according to there own website "a zero-config Rack server for Mac OS X". But it's still needs some configuration... It's really great when working on multiply rack applications. It will boot up the apps you visit in the browser and have support for subdomains so you don't have to mix with your DNS or hosts file. You can read more about pow on there website at

In my case the zero-config part did not apply. Whitout any configurations this is what I see. LoadError: cannot load such file -- bundler/setup

Pow has a good troubleshooting with lots of examples for similar problems.

Because I'm using both ZSH and Rbenv I listen to there advise and put this content in my ~/.powconfig.

export HOME=/Users/ross
export PATH="/usr/local/opt/rbenv/shims:/usr/local/opt/rbenv/bin:$PATH"

Sadly I still have the exact same result as before.

I'm also adding eval "$(rbenv init -)" at the bottom of the file which I read in a issue they linked to in the troubleshooting. Now it tells me that I haven't installed the correct ruby version used for this project which I know I have installed.

Error: rbenv: version `1.9.3-p327' is not installed`

From here I could guess that it's not finding the correct path to my rbenv. When I run echo $(rbenv root) in my terminal and found out that my root path is /usr/local/var/rbenv. I'm also know that rbenv uses RBENV_ROOT and echo $RBENV_ROOT gives the same path in return. So my problem may be that I have multiply versions of rbenv installed. Next step will be to tell pow to use the same version I'm using in my terminal. Just changing the PATH from /usr/local/opt/rbenv to /usr/local/var/rbenv didn't work but when I also set RBENV_ROOT to /usr/local/var/rbenv it did. Yey!!!

My ~/.powconfig file

export HOME=/Users/ross
export RBENV_ROOT=/usr/local/var/rbenv
eval "$(rbenv init -)"