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??? passing `gint (*)()' as argument 1 of `gtk_idle_add(gint (*)(void *), void *)'

I want to add function with this interface to argument
list of gtk_idle_add:

     gint drawPlots();

But when I do this:

     gtk_idle_add(drawPlots, NULL);

I get this at compile time:

     passing `gint (*)()' as argument 1 of `gtk_idle_add(gint (*)(void *), void *)'

Any ideas?

Chris
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