From 0efd1b9efefe107f637784c90643d512bd060c2c Mon Sep 17 00:00:00 2001
From: Max Howell <mxcl@me.com>
Date: Mon, 27 Aug 2012 12:02:57 -0400
Subject: [PATCH] Attempt to fix opt link if absent

This is mainly to prevent errors when users for the transitionary period where most installed kegs do not have an opt link.
---
 Library/Homebrew/build.rb | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index eb3431b9c1..3c15be352a 100755
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -67,10 +67,7 @@ def install f
 
   keg_only_deps.each do |dep|
     opt = HOMEBREW_PREFIX/:opt/dep.name
-
-    #TODO try to fix, if only one key, easy, otherwise check formula.version
-    raise "#{opt} not present\nReinstall #{dep}. Sorry :(" unless opt.directory?
-
+    fixopt(dep) unless opt.directory?
     if not superenv?
       ENV.prepend_path 'PATH', "#{opt}/bin"
       ENV.prepend_path 'PKG_CONFIG_PATH', "#{opt}/lib/pkgconfig"
@@ -128,3 +125,18 @@ def install f
     end
   end
 end
+
+def fixopt f
+  path = if f.linked_keg.directory? and f.linked_keg.symlink?
+    f.linked_keg.readlink
+  elsif f.prefix.directory?
+    f.prefix
+  elsif (kids = f.rack.children).size == 1
+    kids.first
+  else
+    raise
+  end
+  Keg.new(path).optlink
+rescue StandardError
+  "#{opt} not present or broken\nPlease reinstall #{dep}. Sorry :("
+end