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ruby can't find installed gems, but irb can

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John H

05 Jun, 2011 10:14 PM

I've installed some gems (via gem install thegem), but when I try requiring them in Ruby:

require 'rubygems'
require 'thegem'

I get a "no such file to load" error. When I try requiring them inside irb, though, they work fine.

I suspect the problem is something to do with my gem paths, since...

gem env shows

RubyGems Environment:
  - RUBYGEMS VERSION: 1.4.1
  - RUBY VERSION: 1.8.7 (2010-12-23 patchlevel 330) [i686-darwin10]
  - INSTALLATION DIRECTORY: /opt/local/lib/ruby/gems/1.8
  - RUBY EXECUTABLE: /opt/local/bin/ruby
  - EXECUTABLE DIRECTORY: /opt/local/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-darwin-10
  - GEM PATHS:
     - /opt/local/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gempath" => ["/opt/local/lib/ruby/gems/1.8"]
     - :sources => ["http://rubygems.org/", "http://gems.github.com", "http://gems.github.com"]
  - REMOTE SOURCES:
     - http://rubygems.org/
     - http://gems.github.com
     - http://gems.github.com

$: in irb show

/opt/local/lib/ruby/site_ruby/1.8
/opt/local/lib/ruby/site_ruby/1.8/i686-darwin10
/opt/local/lib/ruby/site_ruby
/opt/local/lib/ruby/vendor_ruby/1.8
/opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin10
/opt/local/lib/ruby/vendor_ruby
/opt/local/lib/ruby/1.8
/opt/local/lib/ruby/1.8/i686-darwin10

and $: in ruby shows

/usr/local/lib/ruby/site_ruby/1.9.1
/usr/local/lib/ruby/site_ruby/1.9.1/i386-darwin9.8.0
/usr/local/lib/ruby/site_ruby
/usr/local/lib/ruby/vendor_ruby/1.9.1
/usr/local/lib/ruby/vendor_ruby/1.9.1/i386-darwin9.8.0
/usr/local/lib/ruby/vendor_ruby
/usr/local/lib/ruby/1.9.1
/usr/local/lib/ruby/1.9.1/i386-darwin9.8.0

(i.e., gem env and irb both point to 1.8 folders, but ruby points to a 1.9.1 folder), but I'm not sure how to point ruby to the right directories. Any suggestions?

1. Support Staff 2 Posted by Eric Hodel on 06 Jun, 2011 08:47 PM

   

   You have two different ruby installs, so your PATH is misconfigured. gem and irb point to the /opt/local install while ruby points to the /usr/local install.

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2. 3 Posted by John H on 06 Jun, 2011 09:26 PM

   

   Hmm, when I do a which gem/irb/ruby, though, all three point to binaries in /opt/local/bin (i.e., I get /opt/local/gem, /opt/local/irb, /opt/local/ruby).

   But assuming I'm still confused (very likely!) and that you're right in that ruby points to a different install, what would I need to do to fix my PATH?

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3. Support Staff 4 Posted by Eric Hodel on 06 Jun, 2011 09:48 PM

   

   What do the following say:

   ruby -rubygems -e 'p Gem.ruby'
   
   /opt/local/bin/ruby -rubygems -e 'p Gem.ruby'
   
   /usr/local/bin/ruby -rubygems -e 'p Gem.ruby'
   

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4. 5 Posted by John H on 06 Jun, 2011 09:55 PM

   

   The first and last (ruby and /usr/local/bin/ruby) show /usr/local/bin/ruby. The middle shows /opt/local/bin/ruby.

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5. Support Staff 6 Posted by Eric Hodel on 06 Jun, 2011 11:04 PM

   

   You probably have an alias for ruby that points to /usr/local/bin/ruby, check alias

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6. 7 Posted by John H on 07 Jun, 2011 04:46 PM

   

   Ah, yep, I had an alias for ruby (in order to point it to ruby 1.9 in /usr/local/bin/ruby). Does this mean I need to get gem to point to /usr/local/bin as well? How do I do that?

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7. Support Staff 8 Posted by Eric Hodel on 07 Jun, 2011 08:52 PM

   

   The best way is to stop using alias and change the order of $PATH instead. Place /usr/local/bin in front of /opt/local/bin

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8. 9 Posted by Sam Auciello on 21 Mar, 2012 05:28 PM

   

   I'm having the same issue on my MacBook Pro w/ OS 10.6 except that when I tried the commands from Post #4 above I got the following:

   $ ruby -rubygems -e 'p Gem.ruby'
   ruby: no such file to load -- ubygems (LoadError)
   
   $ /opt/local/bin/ruby -rubygems -e 'p Gem.ruby'
   /opt/local/bin/ruby: no such file to load -- ubygems (LoadError)
   
   $ /usr/local/bin/ruby -rubygems -e 'p Gem.ruby'
   "/usr/local/bin/ruby"
   

   What's the best way to make this work?

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9. Support Staff 10 Posted by Eric Hodel on 21 Mar, 2012 06:19 PM

   

   Sam, you can install rubygems with /opt/local/bin/ruby by following the manual install instructions at the bottom of https://rubygems.org/pages/download

   Or you can remove /opt/local/bin/ruby.

   Check /opt/local/bin/ruby -v and /opt/local/bin/ruby -v. I would remove the older version (likely the one in /opt).

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10. 11 Posted by Sam Auciello on 21 Mar, 2012 06:46 PM

    

    Thanks Eric,

    that fixed it.

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11. Eric Hodel closed this discussion on 21 Mar, 2012 07:24 PM.

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