Ruby version not in ruby-build list for rbenv

问题

I'm using Rails 4.2 and wanted to update my Ruby version as well with rbenv.

I used Homebrew to install ruby-build and no matter how many times I try to update via brew, Ruby version 2.1.3 won't show when I run rbenv install --list.

回答1:

If you installed rbenv and ruby-build with homebrew and when you do echo $(rbenv root), you get /usr/local/var/rbenv instead of /Users/<username>/.rbenv, here is how to fix the issue.

---

When you install rbenv with homebrew, homebrew says:

To use Homebrew's directories rather than ~/.rbenv add to your profile:
export RBENV_ROOT=/usr/local/var/rbenv

Don't do that. Remove that line from your profile. Make sure you refresh your terminal after.

Then remove any signs of rbenv in the /usr/local/var directory:

sudo rm -r /usr/local/var/rbenv

Now when I do echo $(rbenv root) I get /Users/<username>/.rbenv instead of /usr/local/var/rbenv.

That fixed it for me.

回答2:

Usually, follow these steps to install a new Ruby version with rbenv:

$ brew update               
$ brew upgrade ruby-build
$ brew upgrade rbenv

Check which versions are available after updating:

$ ruby-build --definitions

Install a specific version (for example 2.1.3) with:

$ rbenv install 2.1.3

Or if you are interested into improved support for UTF8 characters in the irb console:

$ RUBY_CONFIGURE_OPTS=--with-readline-dir=`brew --prefix readline` rbenv install 2.1.3

After these steps I usually set the newest version as my global default:

$ rbenv global 2.1.3

回答3:

The recommended installation from (https://github.com/sstephenson/ruby-build) states that you should install ruby-build as an rbenv plug-in.

• I uninstalled ruby-build via Homebrew (brew uninstall ruby-build)
• Navigated to ruby-build on my local machine and deleted it
• git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

Now, when I run rbenv install --list, I see Ruby 2.1.3. A quick installation of: rbenv install 2.1.3 and I am now free to use 2.1.3 where I like. This also worked for my teammate.

回答4:

Please update by brew upgrade ruby-build and then you should see 2.1.3 in rbenv install --list

回答5:

You need to update ruby build. After update you can install all current suported versions.

If you using rbenv installed via git use

cd "$(rbenv root)"/plugins/ruby-build && git pull

Or via home brew

$ brew upgrade ruby-build
$ brew upgrade rbenv

来源：https://stackoverflow.com/questions/26433281/ruby-version-not-in-ruby-build-list-for-rbenv