Problems with Ruby gems

I’ve installed two gems today with RubyGem, but whenever I want to use them, I get this error:

If 'sass' is not a typo you can use command-not-found to lookup the package that contains it, like this:
    cnf sass

Same for haml. I’m using openSUSE for the first time and I don’t know what am I doing wrong, this worked perfectly on Debian.

It works now - I installed packages with zypper:

  • ruby2.1-rubygem-haml
  • ruby2.1-rubygem-sass

But why RubyGem doesn’t work?

Depending on what you are doing with Ruby,
You may want to consider what I wrote about installing Ruby…