Support writing audio to a FIFO

Packages describing “fifo” as local USE flag

Package “fifo” Flag Description
media-sound/mpd Support writing audio to a FIFO
net-irc/weechat Enable FIFO support (sh pipes)
app-misc/lcd4linux Enable the FIFO (First-In, First-Out) plugin.

All packages providing a “fifo” USE flag (1)