Update README.MD for macOS (#24)

README.md

@@ -20,9 +20,18 @@ git clone https://github.com/obsproject/obs-deps.git
 
 * Enter the `obs-deps` directory
 * Enter the `macos` directory
-* Unpack pre-built dependencies to `/tmp` by running `tar -xf ./macos-deps-VERSION.tar.gz -C /tmp` (replace `VERSION` with the downloaded/desired version)
-* Unpack pre-built Qt dependency to `/tmp` by running `tar -xf ./macos-qt-QT_VERSION-VERSION.tar.gz -C /tmp` (replace `QT_VERSION` and `VERSION` with the downloaded/desired versions)
-* **IMPORTANT:** Remove the quarantine attribute from the downloaded Qt dependencies by running `xattr -r -d com.apple.quarantine /tmp/obsdeps`
 * (*Optional*) Create the build scripts by running `./build_script_generator.py .github/workflows/build_deps.yml`
 * Run `bash ./build-script-macos-01.sh` to build main dependencies
 * Run `bash ./build-script-macos-02.sh` to build Qt dependency
+
+## Usage
+
+* Common directory to place obs-deps is `/tmp/obsdeps/`, but a custom path can be used
+* Unpack pre-built dependencies to `/tmp` by running `tar -xf ./macos-deps-VERSION.tar.gz -C /tmp` (replace `VERSION` with the downloaded/desired version)
+* Unpack pre-built Qt dependency to `/tmp` by running `tar -xf ./macos-qt-QT_VERSION-VERSION.tar.gz -C /tmp` (replace `QT_VERSION` and `VERSION` with the downloaded/desired versions)
+* **IMPORTANT:** Remove the quarantine attribute from the downloaded Qt dependencies by running `xattr -r -d com.apple.quarantine /tmp/obsdeps`
+* Use `/tmp/obsdeps` as `QTDIR`, `SWIGDIR`, and `DepsPath` when invoking `cmake` for OBS:
+
+```
+cmake -DCMAKE_OSX_DEPLOYMENT_TARGET=10.13 -DQTDIR="/tmp/obsdeps" -DSWIGDIR="/tmp/obsdeps" -DDepsPath="/tmp/obsdeps" [..]
+```