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ENV --- Operator to read environment variables. Use the syntax ``$ENV{VAR}`` to read environment variable ``VAR``. To test whether an environment variable is defined, use the signature ``if(DEFINED ENV{<name>})`` of the :command:`if` command. For general information on environment variables, see the :ref:`Environment Variables <CMake Language Environment Variables>` section in the :manual:`cmake-language(7)` manual.