CMake/Help/variable/CMAKE_INSTALL_PREFIX_INITIA...

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CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT
-------------------------------------------
CMake sets this variable to a ``TRUE`` value when the
:variable:`CMAKE_INSTALL_PREFIX` has just been initialized to
its default value, typically on the first run of CMake within
a new build tree. This can be used by project code to change
the default without overriding a user-provided value:
.. code-block:: cmake
if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
set(CMAKE_INSTALL_PREFIX "/my/default" CACHE PATH "..." FORCE)
endif()