qmake: could not exec '/usr/lib/i386-linux-gnu/qt4/bin/qmake': No such file or directory[...]configure: error: Cannot build Qt apps, probably due to missing or too old Qt packages. Make sure Qt development packages are installed and newer than Qt 5.4. You can disable Qtenv by setting the WITH_QTENV variable to "no" in configure.user.尝试安装qt5-qmake和qtbase5-dev（路径为qt4，但是以后的消息表示“比Qt 5.4更新”）。