i'm having real problems trying to install my EngineYard-hoted RoR app on my Mac (for development)
/james-hughess-macbook-2:futology jameshughes$ gem install json Fetching: json-1.5.1.gem (100%) 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
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-1.5.1 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/json-1.5.1/ext/json/ext/generator/gem_make.out
Any ideas?