Add references for Xcode and the Python Developer's Guideto the internal Mac/README file.
diff --git a/Mac/README b/Mac/README
index 61634e9..2774d10 100644
--- a/Mac/README
+++ b/Mac/README
@@ -86,6 +86,13 @@
and the 10.4u SDK. Starting with Xcode 3 and OS X 10.5, more configurations are
available.
+In general, universal builds depend on specific features provided by the
+Apple-supplied compilers and other build tools included in Apple's Xcode
+development tools. You should install Xcode and the command line tools
+component appropriate for the OS X release you are running on. See the
+Python Developer's Guide (http://docs.python.org/devguide/setup.html)
+for more information.
+
2.1 Flavors of universal binaries
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