Link SDKs in one version of XCode to another (when more than one version of XCode is installed)

xcode_sdk_link.sh

# Usage: ./xcode_sdk_link.sh /Applications/Xcode-<old_version>.app

platforms_path="$1/Contents/Developer/Platforms";
if [ -d $platforms_path ]; then
    for platform in `ls $platforms_path`
    do
        sudo ln -sf $platforms_path/$platform/Developer/SDKs/* $(xcode-select --print-path)/Platforms/$platform/Developer/SDKs;
    done;
fi;