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CMP0074 ------- .. versionadded:: 3.12 :command:`find_package` uses ``<PackageName>_ROOT`` variables. In CMake 3.12 and above the :command:`find_package(<PackageName>)` command now searches prefixes specified by the :variable:`<PackageName>_ROOT` CMake variable and the :envvar:`<PackageName>_ROOT` environment variable. Package roots are maintained as a stack so nested calls to all ``find_*`` commands inside find modules and config packages also search the roots as prefixes. This policy provides compatibility with projects that have not been updated to avoid using ``<PackageName>_ROOT`` variables for other purposes. The ``OLD`` behavior for this policy is to ignore ``<PackageName>_ROOT`` variables. The ``NEW`` behavior for this policy is to use ``<PackageName>_ROOT`` variables. This policy was introduced in CMake version 3.12. 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