Ruby on Rails

Hi guys

I'm a Rails virgin. I'm pulling my hair out with the install.

So far, I've checked that I've got Ruby & Gems, see below;

Pauls-iMac:~ pauldoran$ ruby --version
ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]

Pauls-iMac:~ pauldoran$ gem --version
1.3.6

I'm trying to install Rails as follows;

Pauls-iMac:~ pauldoran$ sudo gem install rails

But get the following error message;

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-1.7.6 for inspection.
Results logged to
/Library/Ruby/Gems/1.8/gems/json-1.7.6/ext/json/ext/generator/gem_make.out

I've read the forum for similar errors but non of the fixes seem to
work.

Any help would be so appreciated.

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