diff --git a/Library/Homebrew/mach.rb b/Library/Homebrew/mach.rb
index ebbc4b57eb..7b9d4d3457 100644
--- a/Library/Homebrew/mach.rb
+++ b/Library/Homebrew/mach.rb
@@ -52,6 +52,7 @@ module MachO
         type = case read(4, offset + 12).unpack("N")[0]
           when 0x00000002, 0x02000000 then :executable
           when 0x00000006, 0x06000000 then :dylib
+          when 0x00000008, 0x08000000 then :bundle
           else :dunno
           end
 
@@ -105,4 +106,8 @@ module MachO
   def mach_o_executable?
     mach_data.map{ |m| m.fetch :type }.include? :executable
   end
+
+  def mach_o_bundle?
+    mach_data.map{ |m| m.fetch :type }.include? :bundle
+  end
 end
diff --git a/Library/Homebrew/test/mach/fat.bundle b/Library/Homebrew/test/mach/fat.bundle
new file mode 100644
index 0000000000..f60f1e8bbc
Binary files /dev/null and b/Library/Homebrew/test/mach/fat.bundle differ
diff --git a/Library/Homebrew/test/mach/i386.bundle b/Library/Homebrew/test/mach/i386.bundle
new file mode 100644
index 0000000000..b6f94710d1
Binary files /dev/null and b/Library/Homebrew/test/mach/i386.bundle differ
diff --git a/Library/Homebrew/test/mach/x86_64.bundle b/Library/Homebrew/test/mach/x86_64.bundle
new file mode 100644
index 0000000000..d1bde419fd
Binary files /dev/null and b/Library/Homebrew/test/mach/x86_64.bundle differ
diff --git a/Library/Homebrew/test/test_mach.rb b/Library/Homebrew/test/test_mach.rb
index a0efb6928c..b9acd337fd 100644
--- a/Library/Homebrew/test/test_mach.rb
+++ b/Library/Homebrew/test/test_mach.rb
@@ -3,6 +3,10 @@ require 'testing_env'
 require 'extend/ARGV' # needs to be after test/unit to avoid conflict with OptionsParser
 ARGV.extend(HomebrewArgvExtension)
 
+def file pn
+  `/usr/bin/file -h '#{pn}'`.chomp
+end
+
 class MachOPathnameTests < Test::Unit::TestCase
   def test_fat_dylib
     pn = Pathname.new("#{TEST_FOLDER}/mach/fat.dylib")
@@ -15,8 +19,7 @@ class MachOPathnameTests < Test::Unit::TestCase
     assert !pn.mach_o_executable?
     assert !pn.text_executable?
     assert pn.arch == :universal
-    assert_match /Mach-O (64-bit )?dynamically linked shared library/,
-      `/usr/bin/file -h '#{pn}'`.chomp
+    assert_match /Mach-O (64-bit )?dynamically linked shared library/, file(pn)
   end
 
   def test_i386_dylib
@@ -29,8 +32,8 @@ class MachOPathnameTests < Test::Unit::TestCase
     assert pn.dylib?
     assert !pn.mach_o_executable?
     assert !pn.text_executable?
-    assert_match /Mach-O (64-bit )?dynamically linked shared library/,
-      `/usr/bin/file -h '#{pn}'`.chomp
+    assert !pn.mach_o_bundle?
+    assert_match /Mach-O dynamically linked shared library/, file(pn)
   end
 
   def test_x86_64_dylib
@@ -43,8 +46,8 @@ class MachOPathnameTests < Test::Unit::TestCase
     assert pn.dylib?
     assert !pn.mach_o_executable?
     assert !pn.text_executable?
-    assert_match /Mach-O (64-bit )?dynamically linked shared library/,
-      `/usr/bin/file -h '#{pn}'`.chomp
+    assert !pn.mach_o_bundle?
+    assert_match /Mach-O 64-bit dynamically linked shared library/, file(pn)
   end
 
   def test_mach_o_executable
@@ -57,8 +60,50 @@ class MachOPathnameTests < Test::Unit::TestCase
     assert !pn.dylib?
     assert pn.mach_o_executable?
     assert !pn.text_executable?
-    assert_match /Mach-O (64-bit )?executable/,
-      `/usr/bin/file -h '#{pn}'`.chomp
+    assert !pn.mach_o_bundle?
+    assert_match /Mach-O (64-bit )?executable/, file(pn)
+  end
+
+  def test_fat_bundle
+    pn = Pathname.new("#{TEST_FOLDER}/mach/fat.bundle")
+    assert pn.universal?
+    assert !pn.i386?
+    assert !pn.x86_64?
+    assert !pn.ppc7400?
+    assert !pn.ppc64?
+    assert !pn.dylib?
+    assert !pn.mach_o_executable?
+    assert !pn.text_executable?
+    assert pn.mach_o_bundle?
+    assert_match /Mach-O (64-bit )?bundle/, file(pn)
+  end
+
+  def test_i386_bundle
+    pn = Pathname.new("#{TEST_FOLDER}/mach/i386.bundle")
+    assert !pn.universal?
+    assert pn.i386?
+    assert !pn.x86_64?
+    assert !pn.ppc7400?
+    assert !pn.ppc64?
+    assert !pn.dylib?
+    assert !pn.mach_o_executable?
+    assert !pn.text_executable?
+    assert pn.mach_o_bundle?
+    assert_match /Mach-O bundle/, file(pn)
+  end
+
+  def test_x86_64_bundle
+    pn = Pathname.new("#{TEST_FOLDER}/mach/x86_64.bundle")
+    assert !pn.universal?
+    assert !pn.i386?
+    assert pn.x86_64?
+    assert !pn.ppc7400?
+    assert !pn.ppc64?
+    assert !pn.dylib?
+    assert !pn.mach_o_executable?
+    assert !pn.text_executable?
+    assert pn.mach_o_bundle?
+    assert_match /Mach-O 64-bit bundle/, file(pn)
   end
 
   def test_non_mach_o
@@ -71,11 +116,10 @@ class MachOPathnameTests < Test::Unit::TestCase
     assert !pn.dylib?
     assert !pn.mach_o_executable?
     assert !pn.text_executable?
+    assert !pn.mach_o_bundle?
     assert pn.arch == :dunno
-    assert_no_match /Mach-O (64-bit )?dynamically linked shared library/,
-      `/usr/bin/file -h '#{pn}'`.chomp
-    assert_no_match /Mach-O [^ ]* ?executable/,
-      `/usr/bin/file -h '#{pn}'`.chomp
+    assert_no_match /Mach-O (64-bit )?dynamically linked shared library/, file(pn)
+    assert_no_match /Mach-O [^ ]* ?executable/, file(pn)
   end
 
   def test_architecture_list_extension
@@ -114,7 +158,7 @@ class TextExecutableTests < Test::Unit::TestCase
     assert pn.text_executable?
     assert_equal [], pn.archs
     assert pn.arch == :dunno
-    assert_match /text executable/, `/usr/bin/file -h '#{pn}'`.chomp
+    assert_match /text executable/, file(pn)
   end
 
   def test_shebang_with_options
@@ -130,7 +174,7 @@ class TextExecutableTests < Test::Unit::TestCase
     assert pn.text_executable?
     assert_equal [], pn.archs
     assert pn.arch == :dunno
-    assert_match /text executable/, `/usr/bin/file -h '#{pn}'`.chomp
+    assert_match /text executable/, file(pn)
   end
 
   def test_malformed_shebang
@@ -146,7 +190,7 @@ class TextExecutableTests < Test::Unit::TestCase
     assert !pn.text_executable?
     assert_equal [], pn.archs
     assert pn.arch == :dunno
-    assert_no_match /text executable/, `/usr/bin/file -h '#{pn}'`.chomp
+    assert_no_match /text executable/, file(pn)
   end
 
   def teardown