I am running ruby 1.8.5 (2006-08-25) on a Red Hat system.  The dbm
package is missing.

$ irb
reuiqrirb(main):001:0> require "dbm"
LoadError: no such file to load -- dbm
	from /opt/ruby-gems/lib/site_ruby/1.8/rubygems/custom_require.rb:
27:in `gem_original_require'
	from /opt/ruby-gems/lib/site_ruby/1.8/rubygems/custom_require.rb:
27:in `require'
	from (irb):1

Is there some additional rpm that I have to tell my sysadmin to
install?