$NetBSD: patch-ac,v 1.4 2009/06/10 21:44:31 minskim Exp $

--- lib/rubygems/install_update_options.rb.orig	2009-03-13 16:01:10.000000000 -0700
+++ lib/rubygems/install_update_options.rb
@@ -34,6 +34,12 @@ module Gem::InstallUpdateOptions
       options[:bin_dir] = File.expand_path(value)
     end
 
+    add_option(:"Install", '-B', '--install-root DIR',
+               'Root directory for gem files on install') do |value, options|
+      options[:install_root] = File.expand_path(value)
+      Gem.ensure_gem_subdirectories File.join options[:install_root], Gem.dir
+    end
+
     add_option(:"Install/Update", '-d', '--[no-]rdoc',
                'Generate RDoc documentation for the gem on',
                'install') do |value, options|