linux build failing

[PMSeitzer]

Probably installing the wrong version of qt. Force the linux build to use qt@5

generating tmp/moc_predefs.h
compiling mainwindow.cpp
compiling qrc_mzroll.cpp
mainwindow.cpp: In member function ‘void MainWindow::Align2()’:
mainwindow.cpp:2045:48: error: ‘SkipEmptyParts’ is not a member of ‘Qt’
         QStringList mzList = mzStr.split("\n", Qt::SkipEmptyParts);
                                                ^
moc filtertagsdialog.h
moc isotopelegendwidget.h
Makefile:37534: recipe for target 'tmp/mainwindow.o' failed
make[1]: *** [tmp/mainwindow.o] Error 1
make[1]: *** Waiting for unfinished jobs....

[PMSeitzer]

There aren't any known linux users right now, so this can be delayed.