Problem installing gem with native extensions

[kurko]

I decided to give chruby a try in a new Mac. It worked like a charm, except for one thing: installing gems that have native extensions.

When trying to rule out the causing factors, I installed rbenv (which I have been using for years) and it worked just fine, so I conclude it's something to do with chruby.

I'm running Mountain Lion.

Reproducing

→ gem install ffi
Building native extensions.  This could take a while...
ERROR:  Error installing ffi:
        ERROR: Failed to build gem native extension.

    /Users/admin/.rubies/ruby-2.0.0-p353/bin/ruby extconf.rb
/Users/admin/.rubies/ruby-2.0.0-p353/bin/ruby: invalid option -2  (-h will show valid options) (RuntimeError)

extconf failed, exit code 1

Gem files will remain installed in /Users/admin/.gem/ruby/2.0.0/gems/ffi-1.9.3 for inspection.
Results logged to /Users/admin/.gem/ruby/2.0.0/extensions/x86_64-darwin-13/2.0.0-static/ffi-1.9.3/gem_make.out

Here's gem_make.out:

→ cat /Users/admin/.gem/ruby/2.0.0/extensions/x86_64-darwin-13/2.0.0-static/ffi-1.9.3/gem_make.out
/Users/admin/.rubies/ruby-2.0.0-p353/bin/ruby extconf.rb
/Users/admin/.rubies/ruby-2.0.0-p353/bin/ruby: invalid option -2  (-h will show valid options) (RuntimeError)

extconf failed, exit code 1

I'll just continue using rbenv now, but I think this would help improving the project :)

[postmodern]

I'm guessing you did chruby ruby 2.0.0-p353 instead of chruby ruby-2.0.0. The second argument of chruby actually sets RUBYOPT.

[tomquas]

@postmodern confirmed. i made the same mistake. my RUBYOPT contained '2.1.1', unsetting it fixes the issue.