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NO_SYSTEM_FROM_IMPORTED
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-----------------------
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Do not treat include directories from the interfaces of consumed
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:ref:`imported targets` as system directories.
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The contents of the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` target property
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are treated as system includes when the consumed target's :prop_tgt:`SYSTEM`
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property is set to true. By default, :prop_tgt:`SYSTEM` is true for imported
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targets and false for other target types. If the ``NO_SYSTEM_FROM_IMPORTED``
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property is set to true on a *consuming* target, compilation of sources in that
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consuming target will not treat the contents of the
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:prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of consumed imported targets as
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system includes, even if that imported target's :prop_tgt:`SYSTEM` property
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is false.
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Directories listed in the :prop_tgt:`INTERFACE_SYSTEM_INCLUDE_DIRECTORIES`
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property of consumed targets are not affected by ``NO_SYSTEM_FROM_IMPORTED``.
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Those directories will always be treated as system include directories by
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consumers.
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This property is initialized by the value of the
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:variable:`CMAKE_NO_SYSTEM_FROM_IMPORTED` variable if it is set when a target
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is created.
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See the :prop_tgt:`EXPORT_NO_SYSTEM` target property to set this behavior
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on the target providing the include directories rather than the target
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consuming them.
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