CMake sets this variable to a
TRUE value when the
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:
if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT) set(CMAKE_INSTALL_PREFIX "/my/default" CACHE PATH "..." FORCE) endif()
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