ruby-debug on ruby 1.9.3

Taken from: http://blog.wyeworks.com/2011/11/1/ruby-1-9-3-and-ruby-debug

First download linecache19-0.5.13.gem and ruby-debug-base19-0.11.26.gem from http://rubyforge.org/frs/?group_id=8883, then …

$ gem install linecache19-0.5.13.gem 
Building native extensions.  This could take a while...
Successfully installed linecache19-0.5.13
1 gem installed
$ gem install ruby-debug-base19-0.11.26.gem -- --with-ruby-include=/Users/rtremaine/.rvm/src/ruby-1.9.3-p194  
Building native extensions.  This could take a while...
Successfully installed ruby-debug-base19-0.11.26

and voilá.

Rails: WARN TCPServer Error: Address already in use - bind(2)

Getting this message when trying to start WEBrick. Run

lsof|grep 3000

then

kill -9

the pid you get from the previous command.