Add instructions to compile on MacOS AMD64 and ARM64 (#244)

* Add instructions to compile on MacOS AMD64 and ARM64
* Update build instructions for QT6
* Update BUILD-INSTRUCTIONS-MACOS.md

docs/BUILD-INSTRUCTIONS-MACOS.md

@@ -2,19 +2,37 @@ gLabels MacOS Build Instructions
 ================================
 
 ## Prerequisites
-
 ```
 brew install cmake
-brew install qt
+brew install qt@6
+```
+
+## Optional dependencies
+```
+brew install zlib
+brew install qrencode
+brew install zint
 ```
 
 ## Compile and Install
 
 <pre>
+export SDKROOT=$(xcrun --show-sdk-path)
+# Detect architecture and set appropriate paths
+if [[ "$(uname -m)" == "arm64" ]]; then
+    # Apple Silicon
+    CMAKE_PATH="/opt/homebrew/bin/cmake"
+    CMAKE_PREFIX_PATH="/opt/homebrew/opt"
+else
+    # Intel
+    CMAKE_PATH="/usr/local/bin/cmake"
+    CMAKE_PREFIX_PATH="/usr/local/opt"
+fi
+
 cd <i>glabels_source_directory</i>
 mkdir build
 cd build
-cmake -D CMAKE_PREFIX_PATH=/usr/local/opt/qt  ..
+$CMAKE_PATH -DCMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH/qt@6 ..
 make
 sudo make install
 </pre>