diff --git a/libexec/irb b/libexec/irb
deleted file mode 100755
index 12f41e4f0a..0000000000
--- a/libexec/irb
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env ruby
-#
-#   irb.rb - interactive ruby
-#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
-#
-
-require "irb"
-
-IRB.start(__FILE__)
diff --git a/libexec/rdoc b/libexec/rdoc
deleted file mode 100755
index 95b6eea277..0000000000
--- a/libexec/rdoc
+++ /dev/null
@@ -1,43 +0,0 @@
-#!/usr/bin/env ruby
-#
-#  RDoc: Documentation tool for source code
-#        (see lib/rdoc/rdoc.rb for more information)
-#
-#  Copyright (c) 2003 Dave Thomas
-#  Released under the same terms as Ruby
-
-begin
-  gem 'rdoc'
-rescue NameError => e # --disable-gems
-  raise unless e.name == :gem
-rescue Gem::LoadError
-end
-
-require 'rdoc/rdoc'
-
-begin
-  r = RDoc::RDoc.new
-  r.document ARGV
-rescue Errno::ENOSPC
-  $stderr.puts 'Ran out of space creating documentation'
-  $stderr.puts
-  $stderr.puts 'Please free up some space and try again'
-rescue SystemExit
-  raise
-rescue Exception => e
-  if $DEBUG_RDOC then
-    $stderr.puts e.message
-    $stderr.puts "#{e.backtrace.join "\n\t"}"
-    $stderr.puts
-  elsif Interrupt === e then
-    $stderr.puts
-    $stderr.puts 'Interrupted'
-  else
-    $stderr.puts "uh-oh! RDoc had a problem:"
-    $stderr.puts e.message
-    $stderr.puts
-    $stderr.puts "run with --debug for full backtrace"
-  end
-
-  exit 1
-end
diff --git a/libexec/ri b/libexec/ri
deleted file mode 100755
index 7fbed0c099..0000000000
--- a/libexec/ri
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env ruby
-
-begin
-  gem 'rdoc'
-rescue NameError => e # --disable-gems
-  raise unless e.name == :gem
-rescue Gem::LoadError
-end
-
-require 'rdoc/ri/driver'
-
-RDoc::RI::Driver.run ARGV