[ruby-gnome2-devel-en] Trying to get xid on gtk3 (3.1.1)

[John L. <jo...@la...>]

I'm porting some code from Python to Ruby and need to get the xid of a
window. I have the following original line of code (in Python):

    self.get_toplevel().get_window().get_xid()

which I have coded in Ruby as

    toplevel.window.xid

However I get

    undefined method `xid' for #<#<Class:0x000000038e40b0>:0x3975b00
ptr=0x28a64d0> (NoMethodError)

The class is a subclass of Gtk::Window.

I've seen other posts that indicate this should work. I can see xid
defined in rbgdkx11x11window.c but surrounded by #ifdef
GDK_WINDOWING_X11. I don't know if this is an issue with how the code
was built ?

I installed using `gem install gtk3`, have gdk3 (3.1.1). This is on an
Arch Linux box with Ruby ruby 2.3.3p222 (2016-11-21 revision 56859)

Thanks for any help.

John