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#include <Availability.h>
#include <TargetConditionals.h>
#if TARGET_OS_OSX
#if __MAC_OS_X_VERSION_MIN_REQUIRED != __MAC_10_11
#error macOS deployment version mismatch
#endif
#elif TARGET_OS_IOS
#if __IPHONE_OS_VERSION_MIN_REQUIRED != __IPHONE_9_1
#error iOS deployment version mismatch
#endif
#elif TARGET_OS_WATCH
#if __WATCH_OS_VERSION_MIN_REQUIRED != __WATCHOS_2_0
#error watchOS deployment version mismatch
#endif
#elif TARGET_OS_TV
#if __TV_OS_VERSION_MIN_REQUIRED != __TVOS_9_0
#error tvOS deployment version mismatch
#endif
#else
#error unknown OS
#endif
void foo()
{
}