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My friends, i could compile an application written with Qt under 10.13.6 and run it on the newly upgraded ios 12.4.6 without any problems.you need to export the following variables, which tell the linker to use sdk 12.1 ####### Custom VariablesEXPORT_QMAKE_MAC_SDK = iphoneosEXPORT_QMAKE_MAC_SDK_VERSION = 12.1EXPORT_QMAKE_XCODE_DEVELOPER_PATH = /Applications/Xcode.app/Contents/DeveloperEXPORT_VALID_ARCHS = arm64 x86_64EXPORT_ACTIVE_ARCHS = $(filter $(EXPORT_VALID_ARCHS), $(ARCHS))EXPORT_ARCH_ARGS = $(foreach arch, $(if $(EXPORT_ACTIVE_ARCHS), $(EXPORT_ACTIVE_ARCHS), $(EXPORT_VALID_ARCHS)), -arch $(arch))EXPORT_QMAKE_XARCH_CFLAGS = $(EXPORT_QMAKE_XARCH_CFLAGS_arm64) $(EXPORT_QMAKE_XARCH_CFLAGS_x86_64)EXPORT_QMAKE_XARCH_LFLAGS = $(EXPORT_QMAKE_XARCH_LFLAGS_arm64) $(EXPORT_QMAKE_XARCH_LFLAGS_x86_64)EXPORT_QMAKE_XARCH_CFLAGS_arm64 = -Xarch_arm64 -miphoneos-version-min=11.0 -Xarch_arm64 -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdkEXPORT_QMAKE_XARCH_LFLAGS_arm64 = -Xarch_arm64 -miphoneos-version-min=11.0 -Xarch_arm64 -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdkEXPORT_QMAKE_XARCH_CFLAGS_x86_64 = -Xarch_x86_64 -mios-simulator-version-min=11.0 -Xarch_x86_64 -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdkEXPORT_QMAKE_XARCH_LFLAGS_x86_64 = -Xarch_x86_64 -mios-simulator-version-min=11.0 -Xarch_x86_64 -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk