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-rw-r--r--tool/lib/webrick/httpserver.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/lib/webrick/httpserver.rb b/tool/lib/webrick/httpserver.rb
index f3f948da3b..e85d059319 100644
--- a/tool/lib/webrick/httpserver.rb
+++ b/tool/lib/webrick/httpserver.rb
@@ -9,6 +9,7 @@
#
# $IPR: httpserver.rb,v 1.63 2002/10/01 17:16:32 gotoyuzo Exp $
+require 'io/wait'
require_relative 'server'
require_relative 'httputils'
require_relative 'httpstatus'