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Install SDL2:
1. Go to the website: https://www.libsdl.org/download-2.0.php 2. Download runtime binaries and extract them. 3. Drag the .framework and drop it into directory: /Library/Frameworks 4. Sign the framework via command: codesign -f -s - SDL2
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Install SDL2 Mixer:
1. Go to the website: https://www.libsdl.org/projects/SDL_mixer/ 2. Download runtime binaries and extract them. 3. Drag the .framework and drop it into directory: /Library/Frameworks 4. Sign the framework via command: codesign -f -s - SDL2_mixer