Update macOS instructions with a bit more details

Author: nikias

content/get-started/macos/1-source.md

@@ -3,15 +3,23 @@ title: From Source <em>(recommended)</em>
 section: get-started/macos
 exclude: true
 ---
-# Open Terminal
+# Building from source
 
-Open a command-line terminal on your machine.
+The provided build script will build the entire libimobiledevice stack with the least
+amount of external dependencies for macOS. Make sure to have Xcode Command Line Tools
+installed. It will build the latest code of every single libimobiledevice sub-project.
 
 # Installation
 
+Open a terminal and type the following commands. During the process you will be asked
+for your user password which has the purpose of allowing the installation of the built
+libraries and tools to **/usr/local/lib** and **/usr/local/bin** via sudo.
+
 ```shell-session
 $ mkdir -p limd-build
 $ cd limd-build
 $ curl -Ls -o limd-build-macos.sh https://is.gd/limdmacos
 $ bash ./limd-build-macos.sh
 ```
+
+The script can be reviewed [here](https://gist.github.com/nikias/84c79469a1d0f16ff95250f0d51858c3).