问题
I am trying to install Ruby 1.9.3 via RVM. However, I keep getting the error in the attached picture.

I would appreciate any help.
回答1:
What you see isn't an error, it's what you should read to understand what you now need to do to configure your environment to install rubies.
回答2:
Not errors; just instructions. Basically, RVM is telling you that Ruby 1.9.3 has dependencies that you need to install before proceeding. Those dependencies can be installed with a package manager such as aptitude (Linux Ubuntu) or Homebrew (Mac).
In your case, you will need Homebrew since you are on the mac.
If you do not yet have homebrew, please go here to install it. Once it is installed, please install the missing dependencies. In your case:
$ brew install libksba
Now, proceed with installing Ruby 1.9.3:
$ rvm install 1.9.3 # install 1.9.3
$ rvm use 1.9.3 --default # makes ruby 1.9.3 the default
Please feel free to post in the comments if you need more help.
来源:https://stackoverflow.com/questions/14073489/rvm-ruby-install-issue