Updated build instructions when working with Homebrew

Working-on-macOS.md

@@ -4,6 +4,10 @@ This guide has been written using the following software:
 - OSX El Capitan (10.11.3)
 - Xcode 7.2.1 (7C1002) 
 
+Homebrew build option tested on:
+- macOS Big Sur (11.3.1)
+- Xcode 12.5
+
 _Steps:_
 
 1) Get a Mac with OSX version 10.11.3.
@@ -16,15 +20,19 @@ _Steps:_
 
 - If you don't want to build it yourself, install Homebrew by executing the following command in Terminal.app:  
 ```
-    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 ```
 - Once Homebrew is installed, run the following command in Terminal:
 ```
-    brew install raylib
+brew install raylib
 ```
 - raylib installs a pkg-config file, which describes the necessary compilation and linker flags to use it with `yourgame`:
 ```
-cc yourgame.c `pkg-config --libs --cflags raylib`
+cc yourgame.c `pkg-config --libs --cflags raylib` -o YourGame
+```
+- If the build fails, you may need to run the following command with the required frameworks
+```
+cc yourgame.c -framework IOKit -framework Cocoa -framework OpenGL `pkg-config --libs --cflags raylib` -o YourGame
 ```
 
 You may get an error, complaining that the `pkg-config` command was not found. You can use `brew install pkgconfig` to fix that.