# Can't install gems with native extensions **URL:** \ **Category:** Ruby\ **Created:** [March 11, 2010, 8:50pm UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015 "2010-03-11T20:50:23Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![nvi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/97f17d/32.png) [@nvi](https://www.ruby-forum.com/u/nvi)\ **Post date:** [March 11, 2010, 8:50pm UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015/1 "2010-03-11T20:50:23Z")
➤ gem install rdiscount Building native extensions. This could take a while… ERROR: Error installing rdiscount: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb WARNING: JRuby does not support native extensions or the `mkmf' library. Check wiki.jruby.org for alternatives. extconf.rb:3: undefined method`dir\_config’ for main:Object (NoMethodError) Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/rdiscount-1.6.3 for inspection. Results logged to /usr/local/lib/ruby/gems/1.8/gems/rdiscount-1.6.3/ext/gem\_make.out I’ve the same problem with RedCloth. I don’t even use jruby. ➤ ruby --version ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin9.7.0] ---
**Author:** ![nvi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/97f17d/32.png) [@nvi](https://www.ruby-forum.com/u/nvi)\ **Post date:** [March 11, 2010, 11:21pm UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015/2 "2010-03-11T23:21:53Z")
On Thu, Mar 11, 2010 at 1:50 PM, Nikita V. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > ➤ ruby --version > ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin9.7.0] Is it possible you have Jruby installed anyway? It sounds like Jruby’s version of gem is running. Try `which gem` or `gem env` to find out. If it is Jruby’s gem, try putting MRI ahead of it in your $PATH. ---
**Author:** ![nvi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/97f17d/32.png) [@nvi](https://www.ruby-forum.com/u/nvi)\ **Post date:** [March 11, 2010, 11:49pm UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015/3 "2010-03-11T23:49:30Z")
Eric C. wrote: > Is it possible you have Jruby installed anyway? Yes. ➤ which jruby /usr/local/bin/jruby I just removed it, but it doesn’t help ➤ rm -rf /usr/local/bin/jruby ➤ jruby -bash: jruby: command not found ➤ gem install rdiscount … same error … > Try `which gem` or `gem env` to find out. ➤ which gem /usr/local/bin/gem ➤ gem env RubyGems Environment: - RUBYGEMS VERSION: 1.3.6 - RUBY VERSION: 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin9.7.0] - INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8 - RUBY EXECUTABLE: /usr/local/bin/ruby - EXECUTABLE DIRECTORY: /usr/local/bin - RUBYGEMS PLATFORMS: - ruby - x86-darwin-9 - GEM PATHS: - /usr/local/lib/ruby/gems/1.8 - /Users/nikitavasilev/.gem/ruby/1.8 - GEM CONFIGURATION: - :update\_sources =\> true - :verbose =\> true - :benchmark =\> false - :backtrace =\> false - :bulk\_threshold =\> 1000 - :sources =\> [“[http://gems.rubyforge.org/](http://gems.rubyforge.org/)”, “[http://gems.github.com](http://gems.github.com)”, “[http://gemcutter.org/](http://gemcutter.org/)”] - REMOTE SOURCES: - [http://gems.rubyforge.org/](http://gems.rubyforge.org/) - [http://gems.github.com](http://gems.github.com) - [http://gemcutter.org/](http://gemcutter.org/) Can’t see problem here. ---
**Author:** ![nvi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/97f17d/32.png) [@nvi](https://www.ruby-forum.com/u/nvi)\ **Post date:** [March 15, 2010, 3:50pm UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015/4 "2010-03-15T15:50:59Z")
I’ve jruby installed via Homebrew. I’ve removed it and re-install ruby. Now all works fine. ---
**Author:** ![nvi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/97f17d/32.png) [@nvi](https://www.ruby-forum.com/u/nvi)\ **Post date:** [April 20, 2010, 2:15am UTC](https://www.ruby-forum.com/t/cant-install-gems-with-native-extensions/185015/5 "2010-04-20T02:15:40Z")
On Mar 15, 10:51 am, Nikita V. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > ## I’ve jruby installed via Homebrew. I’ve removed it and re-install ruby. Now all works fine. > > Posted viahttp://www.ruby-forum.com/. I’m getting this same error, but I would like to find a fix if anyone has any ideas.