The Cocotron is an open source project which implements an Objective-C API similar to that described by Apple Inc.'s Cocoa documentation. This includes the AppKit, Foundation, Objective-C runtime and support APIs such as CoreGraphics and CoreFoundation.
Johannes has updated InstallCDT to gcc 4.3.1. The MinGW environment has also been updated to the most current, w32api-3.11 and mingw-runtime-3.14. Patches are not required for the MinGW headers anymore now that gcc supports ObjC++.