From ba0cfd3582702aa957edf37338c4e8f3391c65bf Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Fri, 15 Nov 2013 00:15:50 -0600
Subject: Improve heuristic for detecting configure

---
 Library/ENV/4.3/cc                   | 4 ++--
 Library/Homebrew/extend/ENV/super.rb | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Library/ENV/4.3/cc b/Library/ENV/4.3/cc
index eeb87e332..d2c7be0ce 100755
--- a/Library/ENV/4.3/cc
+++ b/Library/ENV/4.3/cc
@@ -262,8 +262,8 @@ class Cmd
     !ENV['VERBOSE'].nil? || !ENV['HOMEBREW_VERBOSE'].nil?
   end
   def configure?
-    # configure scripts generated with autoconf 2.56 or later export DUALCASE
-    ENV.key? 'DUALCASE'
+    # configure scripts generated with autoconf 2.61 or later export as_nl
+    ENV.key? 'as_nl'
   end
 end
 
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index a71e4075c..889ac58a0 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -53,9 +53,9 @@ module Superenv
     delete('GREP_OPTIONS') # can break CMake
     delete('CLICOLOR_FORCE') # autotools doesn't like this
 
-    # Configure scripts generated by autoconf 2.56 or later export DUALCASE,
-    # which we use as a heuristic for running under configure
-    delete('DUALCASE')
+    # Configure scripts generated by autoconf 2.61 or later export as_nl, which
+    # we use as a heuristic for running under configure
+    delete('as_nl')
   end
 
   def setup_build_environment(formula=nil)
-- 
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