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End result is I'm trying to get Ruby on Rails installed on my OS 10.7.3, but having various issues. Also, I have a freshly installed XCode 4.3 from the App Store. When I fire up the terminal, and enter: sudo gem install rails and it writes out: 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-1.6.5 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/json-1.6.5/ext/json/ext/parser/gem_make.out In all of the fixes I'm finding says to install XCode, which I have and runs just fine. However, I did uninstall a previous version of XCode to install the latest version, so I'm wondering if there is any relation there. EDIT 1: I've followed Jasdeep suggestion and installed RVM. But once i run: sudo rvm install 1.9.3 I get the following: Fetching yaml-0.1.4.tar.gz to /Users/xxx/.rvm/archives Extracting yaml-0.1.4.tar.gz to /Users/xxx/.rvm/src Configuring yaml in /Users/xxx/.rvm/src/yaml-0.1.4. Error running ' ./configure --prefix="/Users/xxx/.rvm/usr" ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/yaml/configure.log Compiling yaml in /Users/xxx/.rvm/src/yaml-0.1.4. Error running 'make ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/yaml/make.log Database file /Users/xxx/.rvm/config/packages does not exist. gcc-4.2: error trying to exec '/usr/bin/i686-apple-darwin11-gcc-4.2.1': execvp: No such file or directory Installing Ruby from source to: /Users/xxx/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)... ruby-1.9.3-p0

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