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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.