+ - Search::Xapian[2][3] libsearch-xapian-perl
+ - IO::Compress::Gzip[3] perl-modules (or libio-compress-perl)
+ - DBI[3] libdbi-perl
+ - DBD::SQLite[2][3] libdbd-sqlite3-perl
+ - Danga::Socket[4] libdanga-socket-perl
+ - Net::Server[5] libnet-server-perl
+ - Filesys::Notify::Simple[6] libfilesys-notify-simple-perl
+
+[1] - Optional, needed for serving/generating Atom and HTML pages
+[2] - Optional, only required for NNTP server
+[3] - Optional, needed for gzipped mbox support over HTTP
+[4] - Optional, needed for bundled HTTP and NNTP servers
+[5] - Optional, needed for standalone daemonization of HTTP+NNTP servers
+[6] - Optional, needed for public-inbox-watch Maildir watcher