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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.