New issue by schmidh on void-packages repository https://github.com/void-linux/void-packages/issues/16146 Description: ### System * xuname: dmesg: read kernel buffer failed: Operation not permitted Void 5.3.8_2 x86_64 AuthenticAMD uptodate rrFFFFFF* * package: * % xbps-query calibre architecture: x86_64 build-date: 2019-10-21 13:57 UTC changelog: https://raw.githubusercontent.com/kovidgoyal/calibre/master/Changelog.yaml filename-sha256: 3e474cba8e79c486786558c0dce680dfd6702dd8f91adca4e440e4c79b2ecec4 filename-size: 23MB homepage: https://calibre-ebook.com install-date: 2019-11-05 16:40 CET install-script: 1256B installed_size: 59MB license: GPL-3.0-only maintainer: bra1nwave metafile-sha256: 03a011ad43075a1cf611e60a501ec1c37c1234b35121efdf6be55de1ac07e533 pkgver: calibre-4.2.0_1 remove-script: 1251B repository: https://alpha.de.repo.voidlinux.org/current shlib-requires: libpython2.7.so.1.0 libusb-1.0.so.0 libc.so.6 libz.so.1 libcrypto.so.45 libhunspell-1.7.so.0 libstdc++.so.6 libgcc_s.so.1 libm.so.6 libmtp.so.9 libicui18n.so.64 libicuuc.so.64 libQt5Widgets.so.5 libQt5Gui.so.5 libQt5Core.so.5 libGL.so.1 libpthread.so.0 libfontconfig.so.1 libfreetype.so.6 libgthread-2.0.so.0 libglib-2.0.so.0 libQt5DBus.so.5 libpodofo.so.0.9.6 libchm.so.0 short_desc: Ebook management application source-revisions: calibre:8234ff96616 state: installed* ### Expected behavior I want to convert a document to pdf. ### Actual behavior Conversion crashes. ### Steps to reproduce the behavior Open calibre, select `Quick Start Guide`, right-click `Convert Books`, `Convert Individually`. Select `Output Format` `PDF`. Then press `OK` button. When running calibre with `export QT_DEBUG_PLUGINS=1` it prints out following messages: ``` Got keys from plugin meta data ("xcb") QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ... Cannot load library /usr/lib/calibre/calibre/plugins/libheadless.so: (/usr/lib/calibre/calibre/plugins/libheadless.so: undefined symbol: _ZN11QFontEngine22lockedAlphaMapForGlyphEj6QFixedNS_11GlyphFormatERK10QTransformP6QPoint, version Qt_5_PRIVATE_API) QLibraryPrivate::loadPlugin failed on "/usr/lib/calibre/calibre/plugins/libheadless.so" : "Cannot load library /usr/lib/calibre/calibre/plugins/libheadless.so: (/usr/lib/calibre/calibre/plugins/libheadless.so: undefined symbol: _ZN11QFontEngine22lockedAlphaMapForGlyphEj6QFixedNS_11GlyphFormatERK10QTransformP6QPoint, version Qt_5_PRIVATE_API)" qt.qpa.plugin: Could not find the Qt platform plugin "headless" in "/usr/lib/calibre/calibre/plugins" This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: headless (from /usr/lib/calibre/calibre/plugins), wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb. ```