para_gui. Debian package: `libncurses-dev`.
- [GNU
-Readline](http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html). If
+Readline](https://www.gnu.org/software/readline/). If
this library (`libreadline-dev`) is installed, para_client, para_audioc
and para_play support interactive sessions.