From 25e6c6f120782cfa1dfb8223dbcd3bd279978a9c Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Tue, 20 May 2014 22:50:13 -0500
Subject: [PATCH] Don't try to lock the same formula more than once

Fixes Homebrew/homebrew#28765.
---
 Library/Homebrew/formula_installer.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 21c3115d26..28061442e7 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -704,6 +704,7 @@ class FormulaInstaller
         @@locked << dep.to_formula
       end unless ignore_deps?
       @@locked.unshift(f)
+      @@locked.uniq!
       @@locked.each(&:lock)
       @hold_locks = true
     end