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CMAKE_INSTALL_PREFIX
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--------------------
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Install directory used by 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 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 CMAKE_SYSTEM_PREFIX_PATH so
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that find_package, find_program, find_library, find_path, and
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find_file 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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