[docs] Add CocoaPods & QEMU sections

Author: levkropp

BUILD.macOS.md

@@ -27,12 +27,24 @@ This will install Qt 6.2.4 to `~/Qt/6.2.4/macos`.
 
 Adjust accordingly if you customized the Qt install directory.
 
+### CocoaPods
+
+CocoaPods is required to build the Flutter GUI
+
+    sudo gem install cocoapods
+
+You may need to update your version of Ruby first. You can do so with RVM:
+
+    rvm install 3.1.0 && rvm --default use 3.1.0
+
+**Important: RVM/Ruby may require OpenSSL v1, while building Multipass requires OpenSSL v3. Perform this step first before continuing!**
+
 ### Cmake/OpenSSL
 
 Building a Multipass package requires cmake 3.9 or greater. OpenSSL is also necessary at build time. The most convenient
 means to obtain these dependencies is with Homebrew <https://brew.sh/>.
 
-    brew install cmake openssl@3 glib pixman
+    brew install cmake openssl@3
 
 Building
 ---------------------------------------
@@ -45,12 +57,22 @@ If you encounter errors about missing `pkg-config` or `ninja`, install them with
 
 This is required for CMake to find all necessary build tools and dependencies.
 
+#### QEMU Configuration
+
+QEMU is required to build the Multipass tests:
+
+    brew install qemu
+
 If you encounter Python errors about missing `tomli` during the QEMU build step, install it with:
 
     pip3 install tomli
 
 This is required for Python-based build scripts.
 
+You may need additional libraries and packages during the configuration process:
+
+    brew install glib pixman
+
 #### Xcode setup
 
 After installing Xcode, you may need to configure the command line tools and complete the initial setup: