3/7 bitset_iterator_test     FAIL            0.05s   exit status 1
(process:1907675): Gtk-WARNING **: 05:30:44.025: Failed to open display
4/7 tree_model_iterator_test FAIL            0.04s   exit status 1
(process:1907680): Gtk-WARNING **: 05:30:44.029: Failed to open display
5/7 object_move_test         FAIL            0.05s   exit status 1
(process:1907679): Gtk-WARNING **: 05:30:44.029: Failed to open display
6/7 wrap_existing_test       FAIL            0.04s   exit status 1
(process:1907681): Gtk-WARNING **: 05:30:44.029: Failed to open display
7/7 get_children_test        FAIL            0.05s   exit status 1
(process:1907678): Gtk-WARNING **: 05:30:44.029: Failed to open display
Summary of Failures:
3/7 bitset_iterator_test     FAIL            0.05s   exit status 1
4/7 tree_model_iterator_test FAIL            0.04s   exit status 1
5/7 object_move_test         FAIL            0.05s   exit status 1
6/7 wrap_existing_test       FAIL            0.04s   exit status 1
7/7 get_children_test        FAIL            0.05s   exit status 1
Fail:              5   
>>> ERROR: gtkmm4: check failed