I tried to install Ruby 2 using RVM today and it failed. I updated RVM, all my brew formulas and whatnot. This is what I get:
admin:/$ rvm install ruby-2.0.0
Remove lines with 'rvm_autolibs_flag=' from '/etc/rvmrc', please clean it manually, then
rvm get stable rvm autolibs enable rvm install ruby || rvm install ruby --with-gcc=clang