LSMinimumSystemVersion (String - macOS) indicates the minimum version of macOS required for this app to run. This string must be of the form n.n.n where n is a number.

The availability macros defined in /usr/include/AvailabilityMacros.h add weak linking information to system interfaces based on the versions of OS X your project supports. When you create a new project, you tell the compiler which versions of OS X your project supports by setting the deployment target and target SDK in Xcode. The compiler uses these settings to assign appropriate values to the MAC_OS_X_VERSION_MIN_REQUIRED and MAC_OS_X_VERSION_MAX_ALLOWED macros, respectively. For information on how to modify these settings in Xcode, see "Setting Up Cross-Development in Xcode" in SDK Compatibility Guide or the Xcode help.