ruby - When I try sudo gem install json I get the following error

Question

I need to install the JSON gem to start my app but I get the error below whenever I try to install the json gem. Can anyone help me out. I'm using rails 2.2.2 and gems 1.3.1.

Arions-macbook-pro:.ssh arion$ sudo gem install json
Password:
Sorry, try again.
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install json
can't find header files for ruby.


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.1.4 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/json-1.1.4/ext/json/ext/parser/gem_make.out

Answer 1

With Mavericks, you can solve this problem by installing the Xcode Command Line Tools from the command line like this:

xcode-select --install

Update: Don't forget to accept the license agreement after you install or update:

sudo xcodebuild -license