CMake/Help/prop_tgt/NO_SYSTEM_FROM_IMPORTED.rst

NO_SYSTEM_FROM_IMPORTED
-----------------------

Do not treat includes from IMPORTED target interfaces as SYSTEM.

The contents of the INTERFACE_INCLUDE_DIRECTORIES of IMPORTED targets
are treated as SYSTEM includes by default.  If this property is
enabled, the contents of the INTERFACE_INCLUDE_DIRECTORIES of IMPORTED
targets are not treated as system includes.  This property is
initialized by the value of the variable CMAKE_NO_SYSTEM_FROM_IMPORTED
if it is set when a target is created.