$ xhost
access control enabled, only authorized clients can connect
SI:localuser:mpd
LOCAL:
SI:localuser:hoge
sudoコマンドが使える様にする。
# visudo
#Defaults requiretty
hoge hoge-i5=(mpd) NOPASSWD: /usr/bin/audacity,/usr/bin/qjackctl,/usr/bin/quimup,/usr/bin/audacious2
これで
$ sudo -u mpd /usr/bin/qjackctl とかが使える。
参考HP...感謝
http://stackoverflow.com/questions/646930/cannot-connect-to-x-server-0-0-with-a-qt-application

http://piro791.blog.so-net.ne.jp/2010-02-25-1

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