tuntap: look for Kernel.framework headers in the SDK

Formula/tuntap.rb

@@ -1,16 +1,17 @@
-require 'formula'
+require "formula"
 
 class Tuntap < Formula
-  homepage 'http://tuntaposx.sourceforge.net/'
-  url 'git://git.code.sf.net/p/tuntaposx/code', :tag => 'release_20111101'
+  homepage "http://tuntaposx.sourceforge.net/"
+  url "git://git.code.sf.net/p/tuntaposx/code", :tag => "release_20111101"
+  head "git://git.code.sf.net/p/tuntaposx/code", :branch => "master"
 
-  head 'git://git.code.sf.net/p/tuntaposx/code', :branch => 'master'
+  # Get Kernel.framework headers from the SDK
+  patch :DATA
 
   def install
     ENV.j1 # to avoid race conditions (can't open: ../tuntap.o)
-    cd 'tuntap' do
-      # Makefile doesn't take these from the environment
-      # "CCP" is in fact the var used for C++, not CXX
+
+    cd "tuntap" do
       system "make", "CC=#{ENV.cc}", "CCP=#{ENV.cxx}"
       kext_prefix.install "tun.kext", "tap.kext"
       prefix.install "startup_item/tap", "startup_item/tun"
@@ -45,3 +46,33 @@ def caveats; <<-EOS.undent
     EOS
   end
 end
+
+__END__
+diff --git a/tuntap/src/tap/Makefile b/tuntap/src/tap/Makefile
+index d4d1158..1dfe294 100644
+--- a/tuntap/src/tap/Makefile
++++ b/tuntap/src/tap/Makefile
+@@ -19,7 +19,8 @@ BUNDLE_SIGNATURE = ????
+ BUNDLE_PACKAGETYPE = KEXT
+ BUNDLE_VERSION = $(TAP_KEXT_VERSION)
+
+-INCLUDE = -I.. -I/System/Library/Frameworks/Kernel.framework/Headers
++SDKROOT = $(shell xcodebuild -version -sdk macosx Path 2>/dev/null)
++INCLUDE = -I.. -I$(SDKROOT)/System/Library/Frameworks/Kernel.framework/Headers
+ CFLAGS = -Wall -mkernel -force_cpusubtype_ALL \
+ 	-fno-builtin -fno-stack-protector -arch i386 -arch x86_64 \
+ 	-DKERNEL -D__APPLE__ -DKERNEL_PRIVATE -DTUNTAP_VERSION=\"$(TUNTAP_VERSION)\" \
+diff --git a/tuntap/src/tun/Makefile b/tuntap/src/tun/Makefile
+index 9ca6794..c530f10 100644
+--- a/tuntap/src/tun/Makefile
++++ b/tuntap/src/tun/Makefile
+@@ -20,7 +20,8 @@ BUNDLE_SIGNATURE = ????
+ BUNDLE_PACKAGETYPE = KEXT
+ BUNDLE_VERSION = $(TUN_KEXT_VERSION)
+
+-INCLUDE = -I.. -I/System/Library/Frameworks/Kernel.framework/Headers
++SDKROOT = $(shell xcodebuild -version -sdk macosx Path 2>/dev/null)
++INCLUDE = -I.. -I$(SDKROOT)/System/Library/Frameworks/Kernel.framework/Headers
+ CFLAGS = -Wall -mkernel -force_cpusubtype_ALL \
+ 	-fno-builtin -fno-stack-protector -arch i386 -arch x86_64 \
+ 	-DKERNEL -D__APPLE__ -DKERNEL_PRIVATE -DTUNTAP_VERSION=\"$(TUNTAP_VERSION)\" \