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CMP0021
-------

Fatal error on relative paths in :prop_tgt:`INCLUDE_DIRECTORIES` target
property.

CMake 2.8.10.2 and lower allowed the :prop_tgt:`INCLUDE_DIRECTORIES` target
property to contain relative paths.  The base path for such relative
entries is not well defined.  CMake 2.8.12 issues a ``FATAL_ERROR`` if the
:prop_tgt:`INCLUDE_DIRECTORIES` property contains a relative path.

The ``OLD`` behavior for this policy is not to warn about relative paths
in the ``INCLUDE_DIRECTORIES`` target property.  The ``NEW`` behavior for this
policy is to issue a ``FATAL_ERROR`` if ``INCLUDE_DIRECTORIES`` contains a
relative path.

This policy was introduced in CMake version 2.8.12.  CMake version
|release| warns when the policy is not set and uses ``OLD`` behavior.  Use
the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.

.. include:: DEPRECATED.txt