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-----
Unset a variable, cache variable, or environment variable.
::
unset(<variable> [CACHE | PARENT_SCOPE])
Removes the specified variable causing it to become undefined. If
``CACHE`` is present then the variable is removed from the cache instead
of the current scope.
If ``PARENT_SCOPE`` is present then the variable is removed from the scope
above the current scope. See the same option in the :command:`set` command
for further details.
``<variable>`` can be an environment variable such as:
::
unset(ENV{LD_LIBRARY_PATH})
in which case the variable will be removed from the current
environment.
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