Redmine

Centos 6.3, Following given article
[[http://www.devcu.com/forums/topic/311-install-redmine-203-nginx-centos-6/
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CD /var/www/redmine-1/
#bundle install --without development test

Fetching gem metadata from http://rubygems.org/.......
Using rake (0.8.3)
Installing RedCloth (4.2.9) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/ruby.h
Gem files will remain installed in /usr/lib64/ruby/gems/1.8/gems/RedCloth-4.2.9 for inspection.
Results logged to /usr/lib64/ruby/gems/1.8/gems/RedCloth-4.2.9/ext/redcloth_scan/gem_make.out
An error occurred while installing RedCloth (4.2.9), and Bundler cannot continue.
Make sure that `gem install RedCloth -v '4.2.9'` succeeds before bundling.

####Information:####
[root@pm redmine-1]# gem -v
1.3.7
[root@pm redminedjtk]# ruby -v
ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]

[root@pm redmine-1]# cat Gemfile
# file: /var/www/redmine-1/Gemfile
source "http://rubygems.org" 
gem "rake", "0.8.3" 
gem "rack", "1.1.0" 
gem "i18n", "0.4.2" 
gem "rubytree", "0.5.2", :require => "tree" 
gem "RedCloth", "~>4.2.3", :require => "redcloth" # for CodeRay
gem "mysql" 
gem "coderay", "~>0.9.7"