+- Linux::Inotify2 deb: liblinux-inotify2-perl
+ rpm: perl-Linux-Inotify2
+ (for public-inbox-watch on Linux)
+
+- Filesys::Notify::KQueue pkg: p5-Filesys-Notify-KQueue
+ (for public-inbox-watch on FreeBSD)
+
+- IO::Compress (::Gzip) deb: perl-modules (or libio-compress-perl)