From b2309d2f98edd0a2e13611b2ba1de3f510afd378 Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Tue, 2 Apr 2013 16:18:51 -0500
Subject: Fix missing require in x11_dependency.rb

Fixes #18918.
---
 Library/Homebrew/requirements/x11_dependency.rb | 1 +
 1 file changed, 1 insertion(+)

(limited to 'Library')

diff --git a/Library/Homebrew/requirements/x11_dependency.rb b/Library/Homebrew/requirements/x11_dependency.rb
index 5b7015926..c669384c6 100644
--- a/Library/Homebrew/requirements/x11_dependency.rb
+++ b/Library/Homebrew/requirements/x11_dependency.rb
@@ -1,4 +1,5 @@
 require 'requirement'
+require 'extend/set'
 
 class X11Dependency < Requirement
   include Comparable
-- 
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