I am using osx 10.8.2 installed ruby 2.0 and.... got this when trying to run \"sudo gem install rails\"
$
You have to install OpenSSL first and recompile ruby again:
RVM:
rvm pkg install openssl rvm reinstall ruby-2.0.0-p0 --with-gcc=gcc-4.7 --with-openssl-dir=$rvm_path/usr