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New Build Systemが原因でMultiple commands produceというエラーが出るので、Legacy Build Systemに切り替えざるを得ない状況 https://stackoverflow.com/questions/50718018/xcode-10-error-multiple-commands-produce
error: Multiple commands produce '/Users/uesr/Library/Developer/Xcode/DerivedData/OptimalLive-fxatvygbofczeyhjsawtebkimvwx/Build/Products/Debug-iphoneos/OptimalLive.app/Info.plist': 1) Target '