[Bug 268652] Qt5: Some apps fails to start after upgrading to 5.15.8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268652

--- Comment #20 from Tomoaki AOKI <junchoon at dec.sakura.ne.jp> ---
(In reply to Tijl Coosemans from comment #18)

No, but not 100% sure.
I start up my PC on CLI, then, manually startx.
It's based upon an old configuration, before Wayland appears.

But Wayland is pulled in as a dependency by some ports (by default).
So I cannot be 100% sure.

And

% env QT_QPA_PLATFORM=wayland vlc
VLC media player 3.0.18 Vetinari (revision fb4ef23dde67)
[000000082a599060] main libvlc: vlcはデフォルトのインターフェースで実行しています。インターフェースのない vlc
を使用するには'cvlc'を使用してください。
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be
initialized. Reinstalling the application may fix this problem.

zsh: abort (core dumped)  env QT_QPA_PLATFORM=wayland vlc
% lldb --core ~/vlc.core --file /usr/local/bin/vlc
(lldb) target create "/usr/local/bin/vlc" --core "/home/junchoon/vlc.core"
Core file '/home/junchoon/vlc.core' (x86_64) was loaded.
(lldb) bt
* thread #1, name = 'vlc', stop reason = signal SIGABRT
  * frame #0: 0x0000000822f926fa libc.so.7`__sys_thr_kill + 10
    frame #1: 0x0000000822f07624 libc.so.7`__raise + 52
    frame #2: 0x0000000822fbd61c libc.so.7`abort + 76
    frame #3: 0x0000000868267679 libQt5Core.so.5`___lldb_unnamed_symbol7134 + 9
    frame #4: 0x000000086826c1e2 libQt5Core.so.5`QMessageLogger::fatal(char
const*, ...) const + 216
    frame #5: 0x0000000866dc7d49
libQt5Gui.so.5`QGuiApplicationPrivate::createPlatformIntegration() + 6681
    frame #6: 0x0000000866dc7d70
libQt5Gui.so.5`QGuiApplicationPrivate::createEventDispatcher() + 32
    frame #7: 0x00000008684353a6
libQt5Core.so.5`QCoreApplicationPrivate::init() + 1510
    frame #8: 0x0000000866dc236a libQt5Gui.so.5`QGuiApplicationPrivate::init()
+ 42
    frame #9: 0x00000008666975be libQt5Widgets.so.5`QApplicationPrivate::init()
+ 14
    frame #10: 0x0000000861effaf0 libqt_plugin.so`___lldb_unnamed_symbol4088 +
208
    frame #11: 0x0000000861eff9b6 libqt_plugin.so`___lldb_unnamed_symbol4086 +
38
    frame #12: 0x0000000821f8c9ae libthr.so.3`___lldb_unnamed_symbol556 + 318
(lldb)

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