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CMAKE_INSTALL_PREFIX
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--------------------
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Install directory used by :command:`install`.
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If ``make install`` is invoked or ``INSTALL`` is built, this directory is
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prepended onto all install directories. This variable defaults to
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``/usr/local`` on UNIX and ``c:/Program Files/${PROJECT_NAME}`` on Windows.
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On UNIX one can use the ``DESTDIR`` mechanism in order to relocate the
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whole installation. ``DESTDIR`` means DESTination DIRectory. It is
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commonly used by makefile users in order to install software at
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non-default location. It is usually invoked like this:
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::
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make DESTDIR=/home/john install
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which will install the concerned software using the installation
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prefix, e.g. ``/usr/local`` prepended with the ``DESTDIR`` value which
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finally gives ``/home/john/usr/local``.
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WARNING: ``DESTDIR`` may not be used on Windows because installation
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prefix usually contains a drive letter like in ``C:/Program Files``
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which cannot be prepended with some other prefix.
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The installation prefix is also added to :variable:`CMAKE_SYSTEM_PREFIX_PATH`
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so that :command:`find_package`, :command:`find_program`,
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:command:`find_library`, :command:`find_path`, and :command:`find_file`
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will search the prefix for other software.
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.. note::
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Use the :module:`GNUInstallDirs` module to provide GNU-style
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options for the layout of directories within the installation.
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