build failure with gtk3, ‘gobject_’ in glibmmfield has incomplete type

[Andreas E.]

When I try to compile Inkscape with --enable-gtk3-experimental, it fails to build and shows this error:
/usr/include/glibmm-2.4/glibmm/threads.h:201:11: error: field ‘gobject_’ has incomplete type
   GThread gobject_;

Inkscape 0.91.x
Ubuntu 14.04
ii libglibmm-2.4-1c2a:amd64 2.39.4-0ubuntu1 amd64 C++ wrapper for the GLib toolkit (shared libraries)
ii libglibmm-2.4-dev:amd64 2.39.4-0ubuntu1 amd64 C++ wrapper for the GLib toolkit (development files)
ii libgtkmm-2.4-1c2a:amd64 1:2.24.4-1ubuntu1 amd64 C++ wrappers for GTK+ (shared libraries)
ii libgtkmm-2.4-dev:amd64 1:2.24.4-1ubuntu1 amd64 C++ wrappers for GTK+ (development files)
ii libgtkmm-3.0-1:amd64 3.10.1-0ubuntu2 amd64 C++ wrappers for GTK+ (shared libraries)
ii libgtkmm-3.0-dev:amd64 3.10.1-0ubuntu2 amd64 C++ wrappers for GTK+ (development files)