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CMP0021
-------

Fatal error on relative paths in INCLUDE_DIRECTORIES target property.

CMake 2.8.10.2 and lower allowed the 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
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 cmake_policy command to set it to OLD or NEW explicitly.

.. include:: DEPRECATED.txt