Version of Qt required?

[Martin Mathieson via Wireshark-dev <wireshark-dev () wireshark org>]

In a VM where I build Wireshark, I am getting this error on master:

/home/martin/wireshark/ui/qt/follow_stream_dialog.cpp: In member function
‘void FollowStreamDialog::addCodecs(const QMap<QString, QTextCodec*>&)’:
/home/martin/wireshark/ui/qt/follow_stream_dialog.cpp:164:47: error:
‘qAsConst’ was not declared in this scope
     for (const auto &codec : qAsConst(codecMap)) {
                                               ^
ui/qt/CMakeFiles/qtui.dir/build.make:1015: recipe for target
'ui/qt/CMakeFiles/qtui.dir/follow_stream_dialog.cpp.o' failed
make[2]: *** [ui/qt/CMakeFiles/qtui.dir/follow_stream_dialog.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....

My installed version of Qt appears to be 5.6.2.

Looking at CMakeLists.txt, there are various checks for Qt5Widgets, but the
earliest supported version looks like 5.3?

I think  https://doc.qt.io/qt-5/qtglobal.html#qAsConst  was introduced in
5.7.
Do we want to bump the minimum versions?

Martin

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