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You will not actually need to reference this value, but you need to be
aware that it is there. It is the first value in the option descriptor
that you pass to optionProcess. It contains a magic number and
version information. Normally, you should be able to work with a more
recent option library than the one you compiled with. However, if the
library is changed incompatibly, then the library will detect the out of
date magic marker, explain the difficulty and exit. You will then need
to rebuild and recompile your option definitions. This has rarely been
necessary.