sudo gem install rails - error!

[iTenzo]

Does any one know what this error mean... I am trying to install rails gem on mac os x from the terminal issuing this command:

sudo gem install rails

and I'm getting this error:

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

        /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.6.6 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/json-1.6.6/ext/json/ext/generator/gem_make.out

I have no clue as what all this mean. Please help.
Thanks

[scannon]

I don't use OSX but is it necessary to use sudo? Try running just gem install rails.

Also, check out this guide, it should get you moving in the right direction! http://pragmaticstudio.com/blog/2010...rails-ruby-mac

[t.ridge]

Hi iTenzo,

Please see this link, it may be related to your issue:

http://www.ruby-forum.com/topic/191688#1055352

Cheers