Qt compile from source problem for xcb in ubuntu 18

[RahibeMeryem]

Hi,

When I install Qt from the site offical installer all is fine for xcb plugin. But I need to compile from source for mysql plugin availability
( I assume , is there any way to use mysql from offical download? )

When I compile same Qt version from the source Qt5.12.1 from https://download.qt.io/archive/qt/5.12/5.12.1/single/ I cant use the xcb and cant see app neither is working?

What should I do ? The error:

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.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

Aborted (core dumped)

[SGaist]

Hi,

The xcb backend wasn't built, you are likely missing a dependency. You should check the tests log.

I'd say libxkb dev package is missing.

[aha_1980]

@RahibeMeryem I encountered the same problem recently with my developer build on a new Ubuntu 18.04 machine.

I checked the config summary, and now installed:

sudo apt install libxi-dev libxcomposite-dev libxcursor-dev libxtst-dev 

configure is happy now, let's see what happens when the build succeeds.

Regards

[aha_1980]

Unfortunately it didn't help :(

@SGaist, any idea what I could be missing?

Running configuration tests...
Checking for machine tuple... yes
Checking for valid makespec... yes
Checking for target architecture... x86_64
Checking for SSE2 instructions... yes
Checking for AES new instructions... yes
Checking for alloca() in alloca.h... yes
Checking for SSE3 instructions... yes
Checking for SSSE3 instructions... yes
Checking for SSE4.1 instructions... yes
Checking for SSE4.2 instructions... yes
Checking for AVX instructions... yes
Checking for AVX2 instructions... yes
Checking for AVX512 F instructions... yes
Checking for AVX512 BW instructions... yes
Checking for AVX512 CD instructions... yes
Checking for AVX512 DQ instructions... yes
Checking for AVX512 ER instructions... yes
Checking for AVX512 IFMA instructions... yes
Checking for AVX512 PF instructions... yes
Checking for AVX512 VBMI instructions... yes
Checking for AVX512 VL instructions... yes
Checking for C++14 support... yes
Checking for C++1z support... yes
Checking for C99 support... yes
Checking for C11 support... yes
Checking for pkg-config... yes
Checking for D-Bus >= 1.2... yes
Checking for gdb index support... no
Checking for new dtags support... yes
Checking for F16C instructions... yes
Checking for D-Bus >= 1.2 (host)... yes
Checking for udev... yes
Checking for -Og support... yes
Checking for POSIX fallocate()... yes
Checking for precompiled header support... yes
Checking for RDRAND instruction... yes
Checking for symbol visibility support... yes
Checking for -Bsymbolic-functions support... yes
Checking for SHA new instructions... yes
Checking for STL compatibility... yes
Checking for zlib... yes
Checking for Intrinsics without -mXXX argument... yes
Checking for Zstandard... no
Checking for clock_gettime()... yes
Checking for POSIX monotonic clock... yes
Checking for C++11 <future>... yes
Checking for dlopen()... yes
Checking for eventfd... yes
Checking for futimens()... yes
Checking for getauxval()... yes
Checking for getentropy()... yes
Checking for GLib... yes
Checking for POSIX iconv... yes
Checking for ICU... yes
Checking for inotify... yes
Checking for SysV IPC... yes
Checking for linkat()... yes
Checking for ppoll()... yes
Checking for renameat2()... no
Checking for slog2... no
Checking for statx() in libc... no
Checking for 64 bit atomics... yes
Checking for DoubleConversion... no
Checking for PCRE2... no
Checking for O_CLOEXEC... yes
Checking for C++11 <random>... yes
Checking for working std::atomic for function pointers... yes
Checking for OpenSSL Headers... yes
Checking for DTLS support in OpenSSL... yes
Checking for getifaddrs()... yes
Checking for IPv6 ifname... yes
Checking for Linux AF_NETLINK sockets... yes
Checking for OpenSSL 1.1 support... yes
Checking for OCSP stapling support in OpenSSL... yes
Checking for xkbcommon >= 0.5.0... no
Checking for Desktop OpenGL... yes
Checking for KMS... yes
Checking for DRM Atomic API... yes
Checking for EGL... no
Checking for evdev... yes
Checking for FreeType... yes
Checking for Fontconfig... yes
Checking for GBM... no
Checking for libinput... no
Checking for LinuxFB... yes
Checking for mtdev... no
Checking for OpenVG... no
Checking for default QPA platform... xcb
Checking for HarfBuzz... yes
Checking for libjpeg... yes
Checking for libpng... yes
Checking for tslib... no
Checking for Vulkan... no
Checking for XLib... yes
Checking for XCB >= 1.9... yes
Checking for XCB Xlib... yes
Checking for GTK+ >= 3.6... no
Checking for CUPS... yes
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... no
Checking for OCI (Oracle)... no
Checking for ODBC... no
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Checking for Socket CAN... yes
Checking for Socket CAN FD... yes
Checking for Direct3D 12... no
Checking for SDL2... no
Checking for Assimp... no
Checking for Autodesk FBX... no
Checking for Wayland client library... no
Checking for Wayland EGL library... no
Checking for wayland-server... no
Checking for BlueZ... no
Checking for sensorfw... no
Checking for Gypsy... no
Checking for WinRT Geolocation API... no
Checking for ALSA... no
Checking for GStreamer 1.0... no
Checking for GStreamer 0.10... no
Checking for Video for Linux... yes
Checking for OpenAL... no
Checking for PulseAudio >= 0.9.10... no
Checking for libresourceqt5... no
Checking for libclang... no
Checking for alsa... no
Checking for embedded... no
Checking for bison... no
Checking for GCC 6 or newer... yes
Checking for flex... no
Checking for gperf... no
Checking for host pkg-config... /usr/bin/pkg-config
Checking for poppler-cpp... no
Checking for pulseaudio >= 0.9.10... no
Checking for python2... /usr/bin/python2
Checking for d-bus... yes
Checking for fontconfig... yes
Checking for freetype >= 2.4.2... yes
Checking for glib-2.0 >= 2.32.0... yes
Checking for glibc > 2.16... yes
Checking for harfbuzz >= 2.0.0... no
Checking for compatible jpeglib... yes
Checking for jsoncpp... no
Checking for khr... no
Checking for lcms2... yes
Checking for libdrm... yes
Checking for libevent... no
Checking for libvpx... no
Checking for libwebp, libwebpmux and libwebpdemux... no
Checking for libxml2 and libxslt... no
Checking for minizip... no
Checking for system ninja... no
Checking for nss >= 3.26... no
Checking for opus... no
Checking for libpng >= 1.6.0... yes
Checking for protobuf... no
Checking for re2... no
Checking for snappy... no
Checking for x11... yes
Checking for xcomposite... yes
Checking for xcursor... yes
Checking for xi... yes
Checking for xtst... yes
Checking for zlib... yes
Done running configuration tests.

Configure summary:

Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
Compiler: gcc 7.3.0
Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c headersclean largefile optimize_debug precompile_header rdrnd shani warnings_are_errors x86SimdAlways private_tests shared rpath debug c++11 c++14 c++1z concurrent dbus reduce_exports reduce_relocations release_tools stl
Build options:
  Mode ................................... debug; optimized tools
  Optimize debug build ................... yes
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++1z
  Using ccache ........................... no
  Using new DTAGS ........................ yes
  Generating GDB index ................... no
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
    AVX .................................. AVX AVX2
    AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
    Other x86 ............................ AES F16C RDRAND SHA
    Intrinsics without -mXXX option ...... yes
  Build parts ............................ libs tools
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  Qt D-Bus directly linked to libdbus .... yes
  Qt Gui ................................. yes
  Qt Network ............................. yes
  Qt Sql ................................. yes
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... yes
  udev ................................... yes
  Using system zlib ...................... yes
  Zstandard support ...................... no
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... yes
  iconv .................................. no
  ICU .................................... yes
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... no
Qt Network:
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ no
  OpenSSL 1.1 ............................ yes
  DTLS ................................... yes
  OCSP-stapling .......................... yes
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ yes
  Fontconfig ............................. yes
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... yes
    PNG .................................. yes
      Using system libpng ................ yes
  EGL .................................... no
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... yes
    OpenGL ES 2.0 ........................ no
    OpenGL ES 3.0 ........................ no
    OpenGL ES 3.1 ........................ no
    OpenGL ES 3.2 ........................ no
  Vulkan ................................. no
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. no
  xkbcommon .............................. no
  X11 specific:
    XLib ................................. yes
    XCB Xlib ............................. yes
    EGL on X11 ........................... no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. no
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... yes
Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. no
  SQLite2 ................................ no
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... no
Qt Testlib:
  Tester for item models ................. yes
Qt SerialBus:
  Socket CAN ............................. yes
  Socket CAN FD .......................... yes
  SerialPort Support ..................... yes
Qt QML:
  QML network support .................... yes
  QML debugging and profiling support .... yes
  QML tracing JIT support ................ no
  QML sequence object .................... yes
  QML list model ......................... yes
  QML XML http request ................... yes
  QML Locale ............................. yes
  QML delegate model ..................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Qt Quick Designer .......... yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  TableView item ......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  Repeater item .......................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt Scxml:
  ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
  SDL2 ................................... no
Qt 3D:
  Assimp ................................. yes
  System Assimp .......................... no
  Output Qt3D Job traces ................. no
  Output Qt3D GL traces .................. no
  Use SSE2 instructions .................. yes
  Use AVX2 instructions .................. no
  Aspects:
    Render aspect ........................ yes
    Input aspect ......................... yes
    Logic aspect ......................... yes
    Animation aspect ..................... yes
    Extras aspect ........................ yes
Qt 3D Renderers:
  OpenGL Renderer ........................ yes
Qt 3D GeometryLoaders:
  Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
  BlueZ .................................. no
  BlueZ Low Energy ....................... no
  Linux Crypto API ....................... no
  WinRT Bluetooth API (desktop & UWP) .... no
  WinRT advanced bluetooth low energy API (desktop & UWP) . no
Qt Sensors:
  sensorfw ............................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
  Hover support .......................... yes
  Multi-touch support .................... yes
Qt Positioning:
  Gypsy GPS Daemon ....................... no
  WinRT Geolocation API .................. no
Qt Location:
  Qt.labs.location experimental QML plugin . yes
  Geoservice plugins:
    OpenStreetMap ........................ yes
    HERE ................................. yes
    Esri ................................. yes
    Mapbox ............................... yes
    MapboxGL ............................. yes
    Itemsoverlay ......................... yes
QtXmlPatterns:
  XML schema support ..................... yes
Qt Multimedia:
  ALSA ................................... no
  GStreamer 1.0 .......................... no
  GStreamer 0.10 ......................... no
  Video for Linux ........................ yes
  OpenAL ................................. no
  PulseAudio ............................. no
  Resource Policy (libresourceqt5) ....... no
  Windows Audio Services ................. no
  DirectShow ............................. no
  Windows Media Foundation ............... no
Qt Tools:
  QDoc ................................... no
Qt WebEngineCore:
  Qt WebEngine Widgets ................... yes
  Qt WebEngine Qml ....................... yes
  Embedded build ......................... no
  Pepper Plugins ......................... yes
  Printing and PDF ....................... yes
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. yes
  Use System Ninja ....................... no
  Geolocation ............................ yes
  WebChannel support ..................... yes
  Use v8 snapshot ........................ yes
  Kerberos Authentication ................ no
  Extensions ............................. yes
  Use ALSA ............................... no
  Use PulseAudio ......................... no
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . no
    opus ................................. no
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    glib ................................. yes
    zlib ................................. yes
    minizip .............................. no
    libevent ............................. no
    jsoncpp .............................. no
    protobuf ............................. no
    libxml2 and libxslt .................. no
    lcms2 ................................ yes
    png .................................. yes
    JPEG ................................. yes
    harfbuzz ............................. no
    freetype ............................. yes
    x11 .................................. yes
  Required system libraries:
    fontconfig ........................... yes
    dbus ................................. yes
    nss .................................. no
    khr .................................. no
    glibc ................................ yes
  Required system libraries for qpa-xcb:
    libdrm ............................... yes
    xcomposite ........................... yes
    xcursor .............................. yes
    xi ................................... yes
    xtst ................................. yes
Qt WebEngineQml:
  UI Delegates ........................... yes
  Test Support ........................... yes

Note: Also available for Linux: linux-clang linux-icc

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.

Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.

WARNING: gperf is required to build QtWebEngine.

WARNING: bison is required to build QtWebEngine.

WARNING: flex is required to build QtWebEngine.

Qt is now configured for building. Just run 'make'.
Once everything is built, Qt is installed.
You should NOT run 'make install'.
Note that this build cannot be deployed to other machines or devices.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

Ah, indeed it says xkb is missing...

So sudo apt install libxkbcommon-dev libxkbcommon-x11-dev

[SGaist]

It has been removed for the qtbase source tree as all the distributions supported have it.

[aha_1980]

@SGaist I must have missed that mail ;)

[SGaist]

Well... It's in the change log :-)