From 23eac7ab897818689eeff6a810354d85543ad2bb Mon Sep 17 00:00:00 2001
From: Markus Reiter
Date: Tue, 20 Sep 2016 22:24:31 +0200
Subject: Fix DoubleNegation.

---
 Library/Homebrew/extend/ARGV.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Library/Homebrew/extend')

diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index d9f599877..92b4cb898 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -216,7 +216,7 @@ module HomebrewArgvExtension
   end
 
   def build_all_from_source?
-    !!ENV["HOMEBREW_BUILD_FROM_SOURCE"]
+    !ENV["HOMEBREW_BUILD_FROM_SOURCE"].nil?
   end
 
   # Whether a given formula should be built from source during the current
-- 
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