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+CMP0013
+-------
+
+Duplicate binary directories are not allowed.
+
+CMake 2.6.3 and below silently permitted add_subdirectory() calls to
+create the same binary directory multiple times. During build system
+generation files would be written and then overwritten in the build
+tree and could lead to strange behavior. CMake 2.6.4 and above
+explicitly detect duplicate binary directories. CMake 2.6.4 always
+considers this case an error. In CMake 2.8.0 and above this policy
+determines whether or not the case is an error. The OLD behavior for
+this policy is to allow duplicate binary directories. The NEW
+behavior for this policy is to disallow duplicate binary directories
+with an error.
+
+This policy was introduced in CMake version 2.8.0. 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.