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How to use <gtk-requisition>?

From: Jeff Sparkes
Subject: How to use <gtk-requisition>?
Date: Tue, 26 Apr 2011 15:26:36 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (windows-nt)

Guile 1.8.7 on Ubuntu natty.

The guile-gnome documentation doesn't explain how to create a
<gtk-requisition> and I haven't been able to find any examples.
I have a <gtk-fixed> widget and need to resize it's children.  I'm
trying to duplicate some C code exactly.

My best guess, (make-instance <gtk-requisition> #:value '(100 24)) gives
ERROR: In procedure %gvalue-set!:
ERROR: Don't know how to make values of type #<<gvalue-class> <gtk-requisition>>

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