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CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH
--------------------------------------
Controls the default behavior of the following commands for whether or not to
search paths provided by standard system environment variables:
* :command:`find_program`
* :command:`find_library`
* :command:`find_file`
* :command:`find_path`
* :command:`find_package`
This is useful in cross-compiling environments.
By default this variable is not set, which is equivalent to it having
a value of ``TRUE``. Explicit options given to the above commands
take precedence over this variable.
See also the :variable:`CMAKE_FIND_USE_CMAKE_PATH`,
:variable:`CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH`,
:variable:`CMAKE_FIND_USE_CMAKE_SYSTEM_PATH`,
:variable:`CMAKE_FIND_USE_PACKAGE_REGISTRY`,
:variable:`CMAKE_FIND_USE_PACKAGE_ROOT_PATH`,
and :variable:`CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY` variables.
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