From the ChangeLog:

2007-07-07  Jonathon Jongsma  <jjongsma@gnome.org>

	* glib/src/optioncontext.ccg:
	* glib/src/optioncontext.hg: add some new API that was added in glib 2.12,
	including get/set_summary(), get/set_description(), set_translation_domain(),
	and set_translate_fun().
	* glib/src/glib_docs.xml: Regenerated with docextract_to_xml.py
	* glib/src/glib_docs_override.xml: override docs for the new functions so
	that they say that they were introduced in glibmm 2.14 instead of 2.12

Patch attached...  

I'd appreciate some review on the set_translate_func() function in particular, since that one involves more than a simple gmmproc wrapper.  I based it on the cellrenderer set_cell_data_func() function.