CMAKE_ANDROID_API
New in version 3.1.
When Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition, this variable may be set to specify the default value for the ANDROID_API target property. See that target property for additional information.
When Cross Compiling for Android, the CMAKE_SYSTEM_VERSION variable represents the Android API version number targeted. For historical reasons, if a toolchain file sets CMAKE_ANDROID_API, but not CMAKE_SYSTEM_VERSION, the latter will be initialized using the former.
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https://cmake.org/cmake/help/v3.25/variable/CMAKE_ANDROID_API.html