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+CMAKE_HOME_DIRECTORY
+--------------------
+
+Path to top of source tree. Same as :variable:`CMAKE_SOURCE_DIR`.
+
+This is an internal cache entry used to locate the source directory
+when loading a ``CMakeCache.txt`` from a build tree. It should not
+be used in project code. The variable :variable:`CMAKE_SOURCE_DIR`
+has the same value and should be preferred.