macro question

Hello,
I need help with macro style. I sometimes need a macro which outputs
some code, but depending on some variable, I need to add something to
the output or nothing, to be more specific :

I want in a macro to have in let section something like :

`(let ((added-nodes (make-hash-table)))
....

or, sometimes I need this :
`(let ((added-nodes (make-hash-table))
(undo-funcs '()))
...

until now, I have found out that I can only make it happen when I make
the decision before defining `(let ..) and then I need to duplicate
code like this :

(if make-undo
`(let ((added-nodes (make-hash-table))
(undo-funcs '())) ...
`(let ((added-nodes (make-hash-table))) ...

and that is ugly. or maybe make a list like 'result-form' and append
stuff to that?
I just can't use ,(when make-undo `(undo-funcs '())) because it leaves
nil in the list when the condition is not true.

How do you usually solve situations like this?
Or did I miss something in basic macro writing rules?

Thank you,
Karol

.

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