| Add support for macOS 11 and Apple Silicon systems. | |
| It is now possible to build "Universal 2" binaries using | |
| "--enable-universalsdk --with-universal-archs=universal2". | |
| Binaries build on later macOS versions can be deployed back to older | |
| versions (tested up to macOS 10.9), when using the correct deployment | |
| target. This is tested using Xcode 11 and later. |