You can clone with
Do perftools.rb support Ruby 2? I get compile errors like:
perftools.c: In function ‘rb_stack_trace’:
perftools.c:159:9: error: ‘ID_ALLOCATOR’ undeclared (first use in this function)
If Ruby 2 is not supported yet, perhaps required_ruby_version could be set in the Gemspec and mentioned in the README.
Having this issue myself - however, it seems that the perftools itself are not directly to blame, cf.: http://www.ruby-forum.com/topic/4407660