system: Linux mars.sprixweb.com 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64

cmd: 

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()