mpd @0.18.21_0: unable to detect an audio device

[bnilsson11]

I have previously used mpd on an older MacPro1,1 with 10.9. The default audio device was detected ok.

I recently upgraded to Macpro6,1 with 10.10 Yosemite

mpd installed without errors, but will not start on my MacPro6,1:

Bengts-MacPro:mpd bnilsson$ sudo mpd
server_socket: bind to '0.0.0.0:6600' failed: Address already in use (continuing anyway, because binding to '[::]:6600' succeeded)
errno: Failed to open database file "/opt/local/var/lib/mpd/database": No such file or directory
output: No 'audio_output' defined in config file
output: Attempt to detect audio output device
fatal_error: line -1: Unable to detect an audio device

/opt/local/etc/mpd.conf:

music_directory	        "/opt/local/var/lib/mpd/music"
playlist_directory      "/opt/local/var/lib/mpd/playlists"
db_file                 "/opt/local/var/lib/mpd/database"
log_file                "/opt/local/var/log/mpd/log"
state_file              "/opt/local/var/lib/mpd/state"
mixer_type      	"software"
user                    "_mpd"