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