Add sdl2 to BUILDING.md description (#26132)

* Add docs about installing sdl2 variants * Add sdl2 docs
project-chip · Feb 28, 2024 · 2611244 · 2611244
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diff --git a/docs/guides/BUILDING.md b/docs/guides/BUILDING.md
@@ -55,10 +55,26 @@ sudo apt-get install git gcc g++ pkg-config libssl-dev libdbus-1-dev \
      python3-pip unzip libgirepository1.0-dev libcairo2-dev libreadline-dev
 ```
 
+#### UI builds
+
+If building `-with-ui` variant, also install SDL2:
+
+```
+sudo apt-get install libsdl2-dev
+```
+
 ### Installing prerequisites on macOS
 
 On macOS, install Xcode from the Mac App Store.
 
+#### UI builds
+
+If building `-with-ui` variant, also install SDL2:
+
+```
+brew install sdl2
+```
+
 ### Installing prerequisites on Raspberry Pi 4
 
 Complete the following steps: