Error in the pre conditions of xcb for Qt building

MohEdu

Hey,
I'm trying to build Qt on Ubuntu 16.04 OS I'm getting the following error, any suggestions ? I already followed all the documentation and installed the per-requisites.

+ cd qtbase
+ /home/ubuntu/Desktop/DEAWA_RD/Programs/Codes/cura-build-environment/build/Qt-prefix/src/Qt/qtbase/configure -top-level -release -prefix /usr/local -archdatadir /usr/local/lib -datadir /usr/local/share -opensource -confirm-license -nomake examples -nomake tests -nomake tools -no-cups -no-sql-db2 -no-sql-ibase -no-sql-mysql -no-sql-oci -no-sql-odbc -no-sql-psql -no-sql-sqlite -no-sql-sqlite2 -no-sql-tds -skip qtconnectivity -skip qtdoc -skip qtlocation -skip qtmultimedia -skip qtscript -skip qtsensors -skip qtwebchannel -skip qtwebengine -skip qtandroidextras -skip qtactiveqt -skip qttools -skip qtxmlpatterns -skip qt3d -skip qtcanvas3d -skip qtserialport -skip qtwayland -skip qtgamepad -skip qtscxml -rpath -pkg-config -opengl desktop -no-gtk -fontconfig -system-freetype -system-zlib -ssl -openssl-runtime -xcb -xcb-xlib -I /usr/local/include -L /usr/local/lib
Creating qmake...
Done.

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Done running configuration tests.

Configure summary:

Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
Compiler: gcc 5.5.0
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 largefile precompile_header rdrnd shani x86SimdAlways shared shared rpath release c++11 c++14 concurrent dbus reduce_exports reduce_relocations stl
Build options:
 Mode ................................... release
 Optimize release build for size ........ no
 Building shared libraries .............. yes
 Using C standard ....................... C11
 Using C++ standard ..................... C++14
 Using ccache ........................... no
 Using new DTAGS ........................ yes
 Relocatable ............................ yes
 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
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
 Built-in copy of the MIME database ..... yes
 Tracing backend ........................ <none>
 Logging backends:
   journald ............................. no
   syslog ............................... no
   slog2 ................................ no
 PCRE2 .................................. yes
   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
 GSSAPI ................................. no
Qt Gui:
 Accessibility .......................... yes
 FreeType ............................... yes
   Using system FreeType ................ yes
 HarfBuzz ............................... yes
   Using system HarfBuzz ................ no
 Fontconfig ............................. yes
 Image formats:
   GIF .................................. yes
   ICO .................................. yes
   JPEG ................................. yes
     Using system libjpeg ............... yes
   PNG .................................. yes
     Using system libpng ................ yes
 Text formats:
   HtmlParser ........................... yes
   CssParser ............................ yes
   OdfWriter ............................ yes
   MarkdownReader ....................... yes
     Using system libmd4c ............... no
   MarkdownWriter ....................... yes
 EGL .................................... yes
 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 ............................... yes
 INTEGRITY HID .......................... no
 mtdev .................................. no
 tslib .................................. no
 xkbcommon .............................. yes
 X11 specific:
   XLib ................................. yes
   XCB Xlib ............................. yes
   EGL on X11 ........................... yes
   xkbcommon-x11 ........................ no
QPA backends:
 DirectFB ............................... no
 EGLFS .................................. yes
 EGLFS details:
   EGLFS OpenWFD ........................ no
   EGLFS i.Mx6 .......................... no
   EGLFS i.Mx6 Wayland .................. no
   EGLFS RCAR ........................... no
   EGLFS EGLDevice ...................... yes
   EGLFS GBM ............................ no
   EGLFS VSP2 ........................... no
   EGLFS Mali ........................... no
   EGLFS Raspberry Pi ................... no
   EGLFS X11 ............................ yes
 LinuxFB ................................ yes
 VNC .................................... yes
Qt Sql:
 SQL item models ........................ yes
Qt Widgets:
 GTK+ ................................... no
 Styles ................................. Fusion Windows
Qt PrintSupport:
 CUPS ................................... no
Qt Sql Drivers:
 DB2 (IBM) .............................. no
 InterBase .............................. no
 MySql .................................. no
 OCI (Oracle) ........................... no
 ODBC ................................... no
 PostgreSQL ............................. no
 SQLite2 ................................ no
 SQLite ................................. no
   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 ..................... no
Further Image Formats:
 JasPer ................................. yes
 MNG .................................... no
 TIFF ................................... yes
   Using system libtiff ................. yes
 WEBP ................................... yes
   Using system libwebp ................. yes
Qt QML:
 QML network support .................... yes
 QML debugging and profiling support .... yes
 QML just-in-time compiler .............. yes
 QML sequence object .................... yes
 QML XML http request ................... yes
 QML Locale ............................. yes
Qt QML Models:
 QML list model ......................... 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
QtQuick3D:
 Assimp ................................. yes
 System Assimp .......................... no
Qt Quick Controls 2:
 Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
 Hover support .......................... yes
 Multi-touch support .................... yes
Qt TextToSpeech:
 Flite .................................. no
 Flite with ALSA ........................ no
 Speech Dispatcher ...................... no

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

ERROR: Feature 'xcb' was enabled, but the pre-condition 'features.thread && libs.xcb && tests.xcb_syslibs && features.xkbcommon-x11' failed.

Christian Ehrlicher

What Qt version do you try to build?
See https://doc.qt.io/qt-5/supported-platforms.html - Qt5.15 does not support this ancient Ubuntu version.

MohEdu

@Christian-Ehrlicher As a quick solution, do you think if I can ignore 'xcb' to make it work and how ?

Christian Ehrlicher

If you don't need xcb and use wayland - maybe but I doubt you have a correct compiler version - see my link.

JKSH

Hi, and welcome!

@MohEdu said in Error in the pre conditions of xcb for Qt building:

I already followed all the documentation and installed the per-requisites

The log shows that you are missing xkbcommon-x11:

 X11 specific:
   XLib ................................. yes
   XCB Xlib ............................. yes
   EGL on X11 ........................... yes
   xkbcommon-x11 ........................ no

So install libxkbcommon-x11, clean your build tree, and try again.

MohEdu

@Christian-Ehrlicher I have GCC 5.5, any idea how to change the configuration file and ignore xcb ?

MohEdu

@JKSH I installed libxkbcommon-x11-0 any difference with libxkbcommon-x11 ? it couldn't find this one libxkbcommon-x11

SGaist

Hi,

That's because your distribution is too old. Either build an older version of Qt that still provides it or upgrade your distribution to something more recent. Or build that missing library yourself.

KH-219Design

If using Ubuntu 16.04 is somehow a requirement, then I can attest that I was able to compile Qt 5.14 from source on Ubuntu 16.04.

Here is the build script I used.

You should probably apt install most of what is listed here in this other preparatory script of mine.

I also see that I wrote this note to myself, but my memory fails me as to exactly why this was needed:

# if you are on Ubuntu 16.04 you probably need to also run:
#   sudo add-apt-repository ppa:ubuntu-toolchain-r/test
#   sudo apt-get update
#   sudo apt-get install gcc-7 g++-7
#   sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 60
#   sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60