So while attempting to install the linecache19 gem under rvm on ubuntu 12.04 (aka “precise”), I ran into a problem where it took a long, long time to compile.
The fix was fairly simple:
gem install ruby-debug19 -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-p193
where the last bit of that line should match your ruby version. I would imagine this’d work outside RVM with a different source path, too.