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diff --git a/test/runner.rb b/test/runner.rb
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index 49844c7..8e59a85 100644
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--- a/test/runner.rb
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+++ b/test/runner.rb
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@@ -2,6 +2,8 @@ require 'rbconfig'
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 require 'test/unit'
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+require_relative 'ruby/envutil'
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+
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 src_testdir = File.dirname(File.realpath(__FILE__))
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 $LOAD_PATH << src_testdir
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 module Gem