From e5fbc9c92ee103d4fbff80d8e77d46fde2497502 Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Wed, 26 Mar 2014 13:45:46 -0500
Subject: Fall back to Process.gid if we aren't a member of the file's group

---
 Library/Homebrew/extend/pathname.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index cb76c8910..c9c233144 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -110,8 +110,11 @@ class Pathname
 
     FileUtils.mv tf.path, self
 
+    uid = Process.uid
+    gid = Process.groups.delete(old_stat.gid) { Process.gid }
+
     begin
-      chown(old_stat.uid, old_stat.gid)
+      chown(uid, gid)
       chmod(old_stat.mode)
     rescue Errno::EPERM
     end
-- 
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