Could not find or load the Qt platform plugin “xcb” on Archlinux (Write! AppImage)

问题

Trying to install the Write! AppImage on Arch Linux with qt5 installed, freetype2 2.9.1 and fontconfig 2:2.13.1+12+g5f5ec56-1

[levi@astize Write!]$ ./write
This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

While running with QT_DEBUG_PLUGINS=1

[levi@astize Write!]$ ./write
QFactoryLoader::QFactoryLoader() checking directory path "/tmp/.mount_unuY6s/usr/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/tmp/.mount_unuY6s/usr/plugins/platforms/libqxcb.so"
Found metadata in lib /tmp/.mount_unuY6s/usr/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 329989
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/tmp/.mount_unuY6s/usr/bin/platforms" ...
Cannot load library /tmp/.mount_unuY6s/usr/plugins/platforms/libqxcb.so: (/usr/lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var)
QLibraryPrivate::loadPlugin failed on "/tmp/.mount_unuY6s/usr/plugins/platforms/libqxcb.so" : "Cannot load library /tmp/.mount_unuY6s/usr/plugins/platforms/libqxcb.so: (/usr/lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var)"
This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

Any help would be appreciated.

回答1:

I think the problem is related to this error:

/usr/lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var

You should upgrade your fontconfig library. Try with version 2.13.

回答2:

I was struggling with this error after compiling a c++ app in Qt and deploying it to a production machine. Here are some things I did to resolve the issue.

Install the Qt libs. Mine were installed in ~/Qt/5.9.8/gcc_64/lib/ on my dev machine. I simply copied this directory to the production machine.
Use ldd -v /path/to/your/app to find and resolve issues with missing libs.
Set environment vars: LD_LIBRARY_PATH=~/Qt/5.9.8/gcc_64/lib/:/path/to/any/custom/libs/for/your/app QT_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins

来源：https://stackoverflow.com/questions/53752917/could-not-find-or-load-the-qt-platform-plugin-xcb-on-archlinux-write-appimag

标签

qt5

archlinux

freetype2

fontconfig