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SYSTEM
------
.. versionadded:: 3.25
Specifies that a target is a system target. This has the following
effects:
* Entries of :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` are treated as
system include directories when compiling consumers.
Entries of :prop_tgt:`INTERFACE_SYSTEM_INCLUDE_DIRECTORIES` are not
affected, and will always be treated as system include directories.
For imported targets, this property defaults to true, which means
that their :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` are treated
as system directories by default. If their ``SYSTEM`` property is false,
then their :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` will not be
treated as system. Use the :prop_tgt:`EXPORT_NO_SYSTEM` property to change
how a target's ``SYSTEM`` property is set when it is installed.
For non-imported targets, this target property is initialized from
the :prop_dir:`SYSTEM` directory property when the target is created.
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