New comment by hervyqa on void-packages repository

https://github.com/void-linux/void-packages/pull/32301#issuecomment-891235195

Comment:
```
=> pdfarranger-1.7.1_1: running do_check ...
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
creating pdfarranger.egg-info
writing pdfarranger.egg-info/PKG-INFO
writing dependency_links to pdfarranger.egg-info/dependency_links.txt
writing entry points to pdfarranger.egg-info/entry_points.txt
writing requirements to pdfarranger.egg-info/requires.txt
writing top-level names to pdfarranger.egg-info/top_level.txt
writing manifest file 'pdfarranger.egg-info/SOURCES.txt'
reading manifest file 'pdfarranger.egg-info/SOURCES.txt'
adding license file 'COPYING'
writing manifest file 'pdfarranger.egg-info/SOURCES.txt'
running build_ext
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
/builddir/pdfarranger-1.7.1/pdfarranger/splitter.py:17: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk

(setup.py:3814): Gtk-CRITICAL **: 18:11:15.810: gtk_clipboard_get_for_display: assertion 'display != NULL' failed

(setup.py:3814): Gtk-CRITICAL **: 18:11:15.810: gtk_clipboard_get_for_display: assertion 'display != NULL' failed
Unable to init server: Could not connect: Connection refused

(setup.py:3814): Gtk-WARNING **: 18:11:15.811: cannot open display: 
=> ERROR: pdfarranger-1.7.1_1: do_check: 'python3 setup.py ${make_check_target} ${make_check_args}' exited with 1
=> ERROR:   in do_check() at common/build-style/python3-module.sh:40
Error: Process completed with exit code 1.
```

Run test failed. any ideas?