needType = append(needType, n)
			continue
		}

		if (goos == "darwin" || goos == "ios") && strings.HasSuffix(n.C, "Ref") {
			// For FooRef, find out if FooGetTypeID exists.
			s := n.C[:len(n.C)-3] + "GetTypeID"
			n := &Name{Go: s, C: s}
			names = append(names, n)
			optional[n] = true
		}

		// Otherwise, we'll need to find out from gcc.
		names = append(names, n)
	}