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Specify verbosity of installation script code generated by the
:command:`install` command (using the :command:`file(INSTALL)` command).
For paths that are newly installed or updated, installation
may print lines like::
-- Installing: /some/destination/path
For paths that are already up to date, installation may print
lines like::
-- Up-to-date: /some/destination/path
The ``CMAKE_INSTALL_MESSAGE`` variable may be set to control
which messages are printed:
Print both ``Installing`` and ``Up-to-date`` messages.
Print ``Installing`` but not ``Up-to-date`` messages.
Print neither ``Installing`` nor ``Up-to-date`` messages.
Other values have undefined behavior and may not be diagnosed.
If this variable is not set, the default behavior is ``ALWAYS``.