install ruby-debug fail

install-ruby-debug-fail.log

william@desktop:~$ gem install ruby-debug
WARNING:  Error fetching data: SocketError: getaddrinfo: Name or service not known (http://rubygems.org/latest_specs.4.8.gz)
WARNING:  Error fetching data: SocketError: getaddrinfo: Name or service not known (http://rubygems.org/specs.4.8.gz)
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-debug:
	ERROR: Failed to build gem native extension.

        /home/william/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
Can't handle 1.9.x yet
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/home/william/.rvm/rubies/ruby-1.9.3-p194/bin/ruby


Gem files will remain installed in /home/william/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46 for inspection.
Results logged to /home/william/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46/ext/gem_make.out