>>628
~/qjackctl-0.4.5$ ./configure --prefix=/usr/local
と入れたところ、
checking for qmake-qt5... no
checking for qmake... /usr/bin/qmake
checking for Qt major version... qmake: could not exec '/usr/lib/i386-linux-gnu/qt4/bin/qmake': No such file or directory
0
configure: error: qmake-qt5 not found in current PATH. Maybe QT development environment isn't available. (qt5-devel)

という返事が返ってきました。この先どう進めばよいのか分かりません。