xmms plugin
Normally the FLAC plugin for XMMS is installed with a package, but some of the binary builds have a compiled plugin. All that is necessary is to copy libxmms-flac.so to the directory where XMMS looks for input plugins (usually /usr/lib/xmms/Input or $HOME/.xmms/Input). There is nothing else to configure. Make sure to restart XMMS before trying to play any .flac files.

winamp plugin
Since Winamp 5.31, Nullsoft has supplied a FLAC plugin with their Full install; nothing else is needed to get FLAC to play in Wnamp.

Before Winamp 5.31 it was necessary to use our FLAC plugin. If you have an older version of Winamp, our plugin is still available in the FLAC Installer for Windows. The Winamp plugin should work for both Winamp2 and Winamp5. All that is necessary is to copy in_flac.dll to the Plugins/ directory of your Winamp installation. There is nothing else to configure. Make sure to restart Winamp before trying to play any .flac files.