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