There's a two year old blog post here explaining how to fix the error 'you 'have to install development tools first' error that comes with Nokogiri, a problem that arises if you upgrade to Mountain Lion after having installed RVM. In the blog post he says you have to do
rvm update head
rvm --force install 1.9.2
gem install bundle
## in your rails app
bundle
Installing nokogiri (1.4.2) with native extensions
...
rvm update head has now changed to rvm get head. However, after that I blindly did
rvm --force install 1.9.2
and got this error message
rvm --force install 1.9.2
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.8/x86_64/ruby-1.9.2-p320.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
The provided compiler '/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
[1]: http://www.fakingfantastic.com/2010/11/26 /fixing-the-you-have-to-install-development-tools-first-error-with-nokogiri/
In other words, it directed me back to the same blog post.
Looking at RVM website, I blindly did
rvm install 1.9.2
I got this error
ruby-1.9.2-p320 is not installed. To install do: 'rvm install ruby-1.9.2-p320'
Following its instructions, I did rvm install ruby-1.9.2-p320 and got the same binaries error
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.8/x86_64/ruby-1.9.2-p320.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
The provided compiler '/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
Can anyone provide some guidance
you need to run:
rvm get head
rvm autolibs enable
rvm use --install 1.9.2
bundle install
firstly, Install "Command line Tools" from inside Xcode after you'll be good to install "RVM Requirements" and Ruby.
来源：https://stackoverflow.com/questions/14114976/no-binary-rubies-available-for-osx-10-8-x86-64-ruby-1-9-2-p320