Update Platform Prerequisites for macOS Big Sur (ARM Specific)

INSTALL.md

@@ -164,13 +164,21 @@ sudo dnf groupinstall "Development Tools"
 
 ##### macOS
 
-Installing prerequisites on macOS:
+Installing prerequisites on macOS (Big Sur):
 
+You'll need the updated Xcode developer tools:
 ```sh
 xcode-select --install
-sudo easy_install pip
-sudo pip install virtualenv
-brew install pkg-config libffi
+```
+
+Install virtualenv with Pip:
+```sh
+sudo pip3 install virtualenv
+```
+
+Install libjpeg. You can use Homebrew (https://brew.sh):
+```sh
+brew install jpeg
 ```
 
 On macOS Catalina (10.15) you may need to explicitly install OpenSSL

changelog.d/9971.doc

@@ -0,0 +1 @@
+Updated installation dependencies for MacOS Big Sur!