This was included to support reading LOCALC extensions in the process of fixing bug 743448. It does not seems worthwhile to increase the libgsf requirement for this, so we should somehow change this to:

						     CXML2C(attrs[1])));
#ifdef OO_NS_LOCALC_EXT
else if (gsf_xml_in_namecmp (xin, CXML2C (attrs[0]), OO_NS_LOCALC_EXT,
					     "regression-name"))
			style->other_props = g_slist_prepend
				(style->other_props,
				 oo_prop_new_string ("regression-name-constant",
						     CXML2C(attrs[1])));
#endif
else if (oo_attr_bool (xin, attrs, OO_GNUM_NS_EXT,

but I don't know how to do that correctly since OO_NS_LOCALC_EXT is not a macro but a symbol...