libedit - Use the libedit library (replacement for readline)
libffi - Enable support for Foreign Function Interface library
libnotify - Enable desktop notification support
+libressl - Use dev-libs/libressl as SSL provider (might need ssl USE flag), packages should not depend on this USE flag
libsamplerate - Build with support for converting sample rates using libsamplerate
libwww - Add libwww support (General purpose WEB API)
lirc - Add support for lirc (Linux's Infra-Red Remote Control)