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<PackageName>_ROOT
------------------
Calls to :command:`find_package(<PackageName>)` will search in prefixes
specified by the ``<PackageName>_ROOT`` environment variable, where
``<PackageName>`` is the name given to the ``find_package`` call
and ``_ROOT`` is literal. For example, ``find_package(Foo)`` will search
prefixes specified in the ``Foo_ROOT`` environment variable (if set).
See policy :policy:`CMP0074`.
This variable may hold a single prefix or a list of prefixes separated
by ``:`` on UNIX or ``;`` on Windows (the same as the ``PATH`` environment
variable convention on those platforms).
See also the :variable:`<PackageName>_ROOT` CMake variable.
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