shiboken: fix python

Shiboken uses CMake and needs the same help as OpenCV and VTK in
finding the Python Libraries and Headers.

Add code to find them.  Tested on Lion with clang and llvm from
XCode-4.3.3 using System Python, Homebrew Framework and loose
Python.

Fixes Homebrew/homebrew#13563

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/shiboken.rb

@@ -15,10 +15,39 @@ class Shiboken < Formula
     mkdir 'macbuild' do
       args = std_cmake_args + %W[
         -DBUILD_TESTS=OFF
-        ..
       ]
+
+
+      python_prefix = `python-config --prefix`.strip
+      # Python is actually a library. The libpythonX.Y.dylib points to this lib, too.
+      if File.exist? "#{python_prefix}/Python"
+        # Python was compiled with --framework:
+        args << "-DPYTHON_LIBRARY='#{python_prefix}/Python'"
+        if !MacOS.clt_installed? and python_prefix.start_with? '/System/Library'
+          # For Xcode-only systems, the headers of system's python are inside of Xcode
+          args << "-DPYTHON_INCLUDE_DIR='#{MacOS.sdk_path}/System/Library/Frameworks/Python.framework/Versions/2.7/Headers'"
+        else
+          args << "-DPYTHON_INCLUDE_DIR='#{python_prefix}/Headers'"
+        end
+      else
+        python_version = `python-config --libs`.match('-lpython(\d+\.\d+)').captures.at(0)
+        python_lib = "#{python_prefix}/lib/libpython#{python_version}"
+        if File.exists? "#{python_lib}.a"
+          args << "-DPYTHON_LIBRARY='#{python_lib}.a'"
+        else
+          args << "-DPYTHON_LIBRARY='#{python_lib}.dylib'"
+        end
+        args << "-DPYTHON_INCLUDE_DIR='#{python_prefix}/include/#{which_python}'"
+      end
+
+
+      args << '..'
       system 'cmake', *args
       system "make install"
     end
   end
+
+  def which_python
+    "python" + `python -c 'import sys;print(sys.version[:3])'`.strip
+  end
 end