Updated link, original spec link would display a redirect page.

Before:
    mnaser@macbook ~$ curl https://github.com/robduncan/ruby-1.9.2-rpm/raw/master/ruby19.spec                                                    ‹ruby-1.9.2›
    ....You are being <a href="https://raw.github.com/robduncan/ruby-1.9.2-rpm/master/ruby19.spec">redirected</a>....%

After:

mnaser@macbook ~$ curl https://raw.github.com/robduncan/ruby-1.9.2-rpm/master/ruby19.spec                                               1 ↵  ‹ruby-1.9.2›
%define rubyver         1.9.2
%define rubyminorver    p180

%{!?ruby_vendorlib:     %global ruby_vendorlib  %{_prefix}/lib/ruby}
%{!?ruby_vendorarch:    %global ruby_vendorarch %{_libdir}/ruby}
%{!?ruby_sitelib:       %global ruby_sitelib    %{ruby_vendorlib}/site_ruby}
%{!?ruby_sitearch:      %global ruby_sitearch   %{ruby_vendorarch}/site_ruby}


.....