Project ERROR: Unknown module(s) in QT: webenginewidgets in RPI4

[mvsri]

Hello everyone,
I installed QT 5.11.3 in Raspberry Pi 4.
I used following commands to install QT on my RPI

sudo apt-get install qt5-*
sudo apt-get install libqt5*
sudo apt-get install qtcreator

and i read somewhere in QT forum that by following above steps webengine module doesn't get installed. It has to be installed manually.

so what i did is i cloned qtwebengine module from here

git clone git://code.qt.io/qt/qtwebengine.git/

and gone(checkout) to branch with 5.11.3. But when i started

qmake -r

i get error like this:

Submodule qtwebengine-chromium does not exist. Run 'git submodule update --init'.
QtWebEngine will not be built.

I tried updating it but it get stuck there.
can anyone guide me to the right path. the ultimate goal is to include webengine module in qt 5.11.3

Thankyou!

[jsulm]

@mvsri In Ubuntu there is libqt5webenginewidgets5 package. Check whether you have this package in Raspbian (I guess you're using Rasbian?).

[mvsri]

@jsulm i tried to install libqt5webenginewidgets5 earlier but i get this error

E: Unable to locate package libqt5webenginewidgets5

and yes i'm using raspbian

[jsulm]

@mvsri So, "sudo apt install libqt5webenginewidgets5" does not work?

"I tried updating it but it get stuck there" - you mean "git submodule update --init"? What exactly happens then?

[mvsri]

@jsulm yes "sudo apt install libqt5webenginewidgets5" does not work.
and for your second question when i run "git submodule update --init" i get the following message

Submodule 'src/3rdparty' (git://code.qt.io/qt/qtwebengine-chromium.git) registered for path 'src/3rdparty'
Cloning into '/home/pi/qtwebengine/src/3rdparty'...

and nothing happens

[jsulm]

@mvsri Chromium is quite big as far as I know, maybe you should wait a bit longer?

[mvsri]

@jsulm right now what i'm trying to do is.
clone chromium from
git clone git://code.qt.io/qt/qtwebengine-chromium.git/
and try to build it from there for 5.11.3 version.
I don't know if it's right but i think it's worth a try.

[mvsri]

@jsulm i cloned the qtwebengine-chromium and now when i run

"qmake -r"

i am getting the following error

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt WebEngine:
  Embedded build ......................... no
  Pepper Plugins ......................... yes
  Printing and PDF ....................... yes
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. yes
  Use System Ninja ....................... yes
  Geolocation ............................ no
  Use v8 snapshot ........................ yes
  Use ALSA ............................... yes
  Use PulseAudio ......................... yes
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . no
    opus ................................. no
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    libsrtp .............................. no
    glib ................................. yes
    zlib ................................. yes
    minizip .............................. no
    libevent ............................. no
    jsoncpp .............................. no
    protobuf ............................. no
    libxml2 and libxslt .................. yes
    lcms2 ................................ no
    png .................................. yes
    JPEG ................................. yes
    harfbuzz ............................. no
    freetype ............................. no
  Required system libraries:
    fontconfig ........................... no
    dbus ................................. yes
    nss .................................. yes
    khr .................................. yes
    glibc ................................ yes
  Required system libraries for qpa-xcb:
    libdrm ............................... yes
    xcomposite ........................... yes
    xcursor .............................. yes
    xi ................................... yes
    xrandr ............................... yes
    xtst ................................. yes

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.

 
A suitable version of fontconfig could not be found.
QtWebEngine will not be built.

how to solve fontconfig error?

[jsulm]

@mvsri said in Project ERROR: Unknown module(s) in QT: webenginewidgets in RPI4:

how to solve fontconfig error?

install fontconfig-dev package.

[mvsri]

@jsulm it's already installed but still i get error

[jsulm]

@mvsri Then check config.log file to see why fontconfig is set to "no"

[mvsri]

@jsulm i checked in config.log and i found this

loaded result for library config.qtwebengine.libraries.webengine-fontconfig
Trying source 0 (type pkgConfig) of library webengine-fontconfig ...
+ /usr/bin/arm-linux-gnueabihf-pkg-config --exists --silence-errors fontconfig
pkg-config did not find package.
  => source produced no result.
test config.qtwebengine.libraries.webengine-fontconfig FAILED

[jsulm]

@mvsri To be sure: you're building on RaspberryPi and you installed fontconfig and fontconfig-dev there?

[mvsri]

@jsulm yes i'm using rpi4 and i have installed fontconfig and fontconfig-dev and according to this https://doc.qt.io/qt-5/linux-requirements.html i also installed

libfontconfig1-dev

but still i'm getting the error

[mvsri]

This post is deleted!

[mvsri]

@jsulm in config cache file i found this

cache.webengine-fontconfig._KEYS_ = result msgs
cache.webengine-fontconfig.result = false
cache.webengine-fontconfig.msgs = "Trying source 0 (type pkgConfig) of library webengine-fontconfig ..." "+ /usr/bin/arm-linux-gnueabihf-pkg-config --exists --silence-errors fontconfig" "pkg-config did not find package." "  => source produced no result."

can anyone tell me how to link fontconfig lib here.

[jsulm]

@mvsri Sorry, I don't know why it doesn't work. Maybe somebody else can help.

[mvsri]

@jsulm it's okay. maybe someone can help me here. Thanks for your quick response though

[mvsri]

@jsulm Hey there,
I'm trying to install QT 5.12.8 with qtwebengine following the steps from this link
https://www.tal.org/tutorials/building-qt-512-raspberry-pi

when i'm using

make

i get the following error

ninja: build stopped: subcommand failed.
make[4]: *** [Makefile.gn_run:1087: run_ninja] Error 1
make[4]: Leaving directory '/home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine/src/core'
make[3]: *** [Makefile:82: sub-gn_run-pro-make_first] Error 2
make[3]: Leaving directory '/home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine/src/core'
make[2]: *** [Makefile:81: sub-core-make_first] Error 2
make[2]: Leaving directory '/home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine/src'
make[1]: *** [Makefile:49: sub-src-make_first] Error 2
make[1]: Leaving directory '/home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine'
make: *** [Makefile:1005: module-qtwebengine-make_first] Error 2

Do you have any idea what could the problem be?
I also checked the file in path

/home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine/src/core/Makefile.gn_run

it is as follows

run_ninja:
ninja -v -C /home/pi/Desktop/qt-everywhere-src-5.12.8/qtwebengine/src/core/release QtWebEngineCore

[jsulm]

@mvsri said in Project ERROR: Unknown module(s) in QT: webenginewidgets in RPI4:

Do you have any idea what could the problem be?

You did not post the actual errors, those should be above what you posted.