sonja@sonja-mint ~ $ gem install gemcutter
/usr/local/lib/ruby/1.9.1/rubygems/package.rb:10:in `require': no such file to load -- zlib (LoadError)
	from /usr/local/lib/ruby/1.9.1/rubygems/package.rb:10:in `<top (required)>'
	from /usr/local/lib/ruby/1.9.1/rubygems/format.rb:9:in `require'
	from /usr/local/lib/ruby/1.9.1/rubygems/format.rb:9:in `<top (required)>'
	from /usr/local/lib/ruby/1.9.1/rubygems/installer.rb:11:in `require'
	from /usr/local/lib/ruby/1.9.1/rubygems/installer.rb:11:in `<top (required)>'
	from /usr/local/lib/ruby/1.9.1/rubygems/dependency_installer.rb:3:in `require'
	from /usr/local/lib/ruby/1.9.1/rubygems/dependency_installer.rb:3:in `<top (required)>'
	from /usr/local/lib/ruby/1.9.1/rubygems/commands/install_command.rb:4:in `require'
	from /usr/local/lib/ruby/1.9.1/rubygems/commands/install_command.rb:4:in `<top (required)>'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:140:in `require'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:140:in `rescue in load_and_instantiate'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:132:in `load_and_instantiate'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:65:in `[]'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:118:in `find_command'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:104:in `process_args'
	from /usr/local/lib/ruby/1.9.1/rubygems/command_manager.rb:75:in `run'
	from /usr/local/lib/ruby/1.9.1/rubygems/gem_runner.rb:39:in `run'
	from /usr/local/bin/gem:24:in `<main>'
sonja@sonja-mint ~ $