How do I associate a new rvm install with existing ruby versions?

Question

I was having a problem with RVM, so I uninstalled and re-installed it. The truth is I actually tried rbenv, but that didn't work out for me so I am trying to get rvm up and running again - without having to install duplicate versions of Ruby. I have at least 1 existing version of Ruby installed: ``` ruby --version ruby 1.8.7 (2011-12-28 patchlevel 357) [universal-darwin11.0] ``` But when I do `rvm list` I get a blank list: ``` bash-3.2$ rvm list rvm rubies # Default ruby not set. Try 'rvm alias create default <ruby>'. # => - current # =* - current && default # * - default ``` So my question has two parts: - How do I see all the versions of Ruby on my system (given that rvm is not showing me any)? - How do I associate the new RVM install with the existing versions of Ruby? Or am I better off removing all existing versions of Ruby and re-installing everything? That seems like a pain in the ass though.

Accepted Answer

You can add an existing ruby to rvm using:

```
rvm mount /path/to/ruby 
```

or:

```
rvm automount
```

but be careful as ruby installed in system might have hardcoded paths for gems - so gemsets would not work with it.

There is also new way of adding binary rubies (already compiled), for list of available builds for your platform run:

```
rvm list remote
```

and you can install those rubies using:

```
rvm mount -r 1.9.3
```

This might be default way of installing ruby to avoid compilation in next stable release of RVM - but it will work only for ruby 1.9.3+.

How do I associate a new rvm install with existing ruby versions?

Solution

Problem