From 23b4da18c22bd05345a8baabfcb0325908d18b63 Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Mon, 7 Jul 2014 19:47:10 -0500
Subject: Only call proc if it is set

Fixes Homebrew/homebrew#30723.
Fixes Homebrew/homebrew#30724.
Fixes Homebrew/homebrew#30727.
---
 Library/Homebrew/build_environment.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/build_environment.rb b/Library/Homebrew/build_environment.rb
index 7bff387b1..4f4812bcd 100644
--- a/Library/Homebrew/build_environment.rb
+++ b/Library/Homebrew/build_environment.rb
@@ -25,7 +25,7 @@ class BuildEnvironment
   end
 
   def modify_build_environment(receiver)
-    receiver.instance_eval(&proc)
+    receiver.instance_eval(&proc) if self.proc
   end
 
   def marshal_dump
-- 
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