How can I add a new function in options.c?

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I am trying to do some small changes to the options.c file in the
fn-derivatives plugin directory (just for my own use): mainly just changing
the default cost-of-carry to be equal to the risk-free rate rather than
zero. I'd prefer to just add a new function with the changed default as
opposed to modifying the existing function, but I cannot find any
documentation on the steps to do this and it is not very obvious from the
source. Any pointers? I am working with the "beyond linux from scratch"
version of the sources.

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<div dir="ltr">I am trying to do some small changes to the options.c file in the 
fn-derivatives plugin directory (just for my own use): mainly just changing the default 
cost-of-carry to be equal to the risk-free rate rather than zero. I&#39;d 
prefer to just add a new function with the changed default as opposed to
 modifying the existing function, but I cannot find any documentation on
 the steps to do this and it is not very obvious from the source. Any 
pointers? I am working with the &quot;beyond linux from scratch&quot; version of 
the sources.<div class="gmail-yj6qo"></div><div class="gmail-adL"><br><br></div></div>

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