Passing C pointers through guile

[Maciek Godek]

Hi,
is there any portable and recommended way for passing C pointers around
in guile environment?
I think of something like scm_to_ptr (analogous to scm_to_int etc.).
Certainly such a value would be completely useless for the interpreter.
One can achieve simillar functionality using the aforementioned
scm_to_int (keeping track on the word length of the build target),
but it seems rather unnatural.

Perhaps the need for passing pointers is a sign of a weakness
in design of a given system, is it so?

very good regards
mg