From 6762780f3efd4dcdc2d59438d2a5a93c054c372f Mon Sep 17 00:00:00 2001
From: Xiyue Deng <manphiz@gmail.com>
Date: Wed, 31 Oct 2012 02:44:18 -0700
Subject: [PATCH] Whitelist Homebrew's own prefix in superenv.

This allows Homebrew to be installed into /opt or /sw.

Closes Homebrew/homebrew#15780.

Signed-off-by: Max Howell <mxcl@me.com>

Cleaned up the patch a little. Still ugly though, but logic is unusual so that's just how it is.
---
 Library/ENV/4.3/cc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Library/ENV/4.3/cc b/Library/ENV/4.3/cc
index cdf69e5f3d..6c1b4a0b79 100755
--- a/Library/ENV/4.3/cc
+++ b/Library/ENV/4.3/cc
@@ -120,12 +120,16 @@ class Cmd
         args << "-I#{path}" if iset.add?(path.cleanpath)
       when /^-L(.+)/
         path = $1.chuzzle || whittler.next
-        case path.cleanpath
+        doit = case path.cleanpath
+        when %r{^#$brewfix}
+          # maybe homebrew is installed to /sw or /opt/brew
+          true
         when %r{^/opt}, %r{^/sw}, %r{/usr/X11}
-          # NOOP
+          false
         else
-          args << "-L#{path}" if lset.add?(path.cleanpath)
+          true
         end
+        args << "-L#{path}" if doit and lset.add?(path.cleanpath)
       else
         args << arg
       end