IMPORTED

From Get docs
Cmake/docs/3.21/prop tgt/imported


IMPORTED

Read-only indication of whether a target is IMPORTED.

The boolean value of this property is True for targets created with the IMPORTED option to add_executable() or add_library(). It is False for targets built within the project.

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https://cmake.org/cmake/help/v3.21/prop_tgt/IMPORTED.html