Update README.md with macOS build instructions

README.md

@@ -9,7 +9,7 @@
  - Upscaling and true colour (24-bit) in hardware renderers
  - "Fast boot" for skipping BIOS splash/intro
  - Save state support
- - Windows and Linux support - macOS may work, but not actively maintained
+ - Windows, Linux, **highly experimental** macOS support
  - Supports bin/cue images, raw bin/img files, and MAME CHD formats.
  - Direct booting of homebrew executables
  - Digital and analog controllers for input (rumble is forwarded to host)
@@ -65,6 +65,22 @@ Requirements (Debian/Ubuntu package names):
 4. Compile the source code. For the example above, run `ninja`.
 5. Run the binary, located in the build directory under `src/duckstation-sdl/duckstation-sdl`, or `src/duckstation-qt/duckstation-qt`.
 
+### macOS
+**NOTE:** macOS is highly experimental and not tested by the developer. Use at your own risk, things may be horribly broken.
+
+Requirements:
+ - CMake (installed by default? otherwise, `brew install cmake`)
+ - SDL2 (`brew install sdl2`)
+ - Qt 5 (`brew install qt5`)
+
+1. Clone the repository. Submodules aren't necessary, there is only one and it is only used for Windows.
+2. Create a build directory, either in-tree or elsewhere, e.g. `mkdir build-release`, `cd build-release`.
+3. Run cmake to configure the build system: `cmake -DCMAKE_BUILD_TYPE=Release -DQt5_DIR=/usr/local/opt/qt/lib/cmake/Qt5 ..`. You may need to tweak `Qt5_DIR` depending on your system.
+4. Compile the source code: `make`. Use `make -jN` where `N` is the number of CPU cores in your system for a faster build.
+5. Run the binary, located in the build directory under `src/duckstation-sdl/duckstation-sdl`, or `src/duckstation-qt/duckstation-qt`.
+
+Application bundles/.apps are currently not created, so you can't launch it via Finder yet. This is planned for the future.
+
 ### Android
 **NOTE:** The Android frontend is still incomplete, not all functionality works and some paths are hard-coded.
 **The Android app is currently broken and fixing it is not a priority. However, this will change in the future.**