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+set
+---
+
+Set a normal, cache, or environment variable to a given value.
+See the :ref:`cmake-language(7) variables <CMake Language Variables>`
+documentation for the scopes and interaction of normal variables
+and cache entries.
+
+Signatures of this command that specify a ``<value>...`` placeholder
+expect zero or more arguments.  Multiple arguments will be joined as
+a :ref:`;-list <CMake Language Lists>` to form the actual variable
+value to be set.  Zero arguments will cause normal variables to be
+unset.  See the :command:`unset` command to unset variables explicitly.
+
+Set Normal Variable
+^^^^^^^^^^^^^^^^^^^
+
+::
+
+  set(<variable> <value>... [PARENT_SCOPE])
+
+Set the given ``<variable>`` in the current function or directory scope.
+
+If the ``PARENT_SCOPE`` option is given the variable will be set in
+the scope above the current scope.  Each new directory or function
+creates a new scope.  This command will set the value of a variable
+into the parent directory or calling function (whichever is applicable
+to the case at hand). The previous state of the variable's value stays the
+same in the current scope (e.g., if it was undefined before, it is still
+undefined and if it had a value, it is still that value).
+
+Set Cache Entry
+^^^^^^^^^^^^^^^
+
+::
+
+  set(<variable> <value>... CACHE <type> <docstring> [FORCE])
+
+Set the given cache ``<variable>`` (cache entry).  Since cache entries
+are meant to provide user-settable values this does not overwrite
+existing cache entries by default.  Use the ``FORCE`` option to
+overwrite existing entries.
+
+The ``<type>`` must be specified as one of:
+
+``BOOL``
+  Boolean ``ON/OFF`` value.  :manual:`cmake-gui(1)` offers a checkbox.
+
+``FILEPATH``
+  Path to a file on disk.  :manual:`cmake-gui(1)` offers a file dialog.
+
+``PATH``
+  Path to a directory on disk.  :manual:`cmake-gui(1)` offers a file dialog.
+
+``STRING``
+  A line of text.  :manual:`cmake-gui(1)` offers a text field or a
+  drop-down selection if the :prop_cache:`STRINGS` cache entry
+  property is set.
+
+``INTERNAL``
+  A line of text.  :manual:`cmake-gui(1)` does not show internal entries.
+  They may be used to store variables persistently across runs.
+  Use of this type implies ``FORCE``.
+
+The ``<docstring>`` must be specified as a line of text providing
+a quick summary of the option for presentation to :manual:`cmake-gui(1)`
+users.
+
+If the cache entry does not exist prior to the call or the ``FORCE``
+option is given then the cache entry will be set to the given value.
+Furthermore, any normal variable binding in the current scope will
+be removed to expose the newly cached value to any immediately
+following evaluation.
+
+It is possible for the cache entry to exist prior to the call but
+have no type set if it was created on the :manual:`cmake(1)` command
+line by a user through the ``-D<var>=<value>`` option without
+specifying a type.  In this case the ``set`` command will add the
+type.  Furthermore, if the ``<type>`` is ``PATH`` or ``FILEPATH``
+and the ``<value>`` provided on the command line is a relative path,
+then the ``set`` command will treat the path as relative to the
+current working directory and convert it to an absolute path.
+
+Set Environment Variable
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+::
+
+  set(ENV{<variable>} <value>...)
+
+Set the current process environment ``<variable>`` to the given value.