Subject: | couldn't connect to display ":0" |
The test suite fails if there's no running X11 display:
...
couldn't connect to display ":0" at /opt/perl-5.28.2/lib/site_perl/5.28.2/x86_64-linux/Tk/MainWindow.pm line 53.
MainWindow->new() at test.pl line 19.
Makefile:837: recipe for target 'test_dynamic' failed
make: *** [test_dynamic] Error 111
...
Best is to skip the test suite if the creation of the MainWindow fails.