various MacOSX SDKs
Just in case you have a need or desire to build something using an older version of the MacOS SDK, they can be found here.
- MacOSX10.6.sdk: Snow Leopard
- MacOSX10.7.sdk: Lion
- MacOSX10.8.sdk: Mountain Lion
- MacOSX10.9.sdk: Mavericks
- MacOSX10.10.sdk: Yosemite
- MacOSX10.11.sdk: El Capitan