+$xurls{'gzip(1)'} = 'https://manpages.debian.org/stable/gzip/gzip.1.en.html';
+$xurls{'chmod(1)'} =
+ 'https://manpages.debian.org/stable/coreutils/chmod.1.en.html';
+$xurls{'kqueue(2)'} =
+ 'https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2';
+$xurls{'notmuch(1)'} = 'https://notmuchmail.org/manpages/notmuch-1/';
+$xurls{'mairix(1)'} =
+ 'https://manpages.debian.org/stable/mairix/mairix.1.en.html';