Qt installation is missing libxcb

mzimmers

Hi all -

After a long sojourn in Windows purgatory, I'm finally returning to Linux-land, using WSL2. The last time I did this, I was using Qt 5. I remember reading somewhere that more recent versions of Qt aren't including everything that the older versions did.

I'm trying to run the qt-unified-linux-x64-4.6.0-online.run, and am getting an error:

./qt-unified-linux-x64-4.6.0-online.run: error while loading shared libraries: libxcb-icccm.so.4: cannot open shared object file: No such file or directory

Do I need to install libxcb myself? If so, should I just download it from freedesktop?

Thanks...

mzimmers

For anyone who may happen to need this information, here are the xcb libraries I needed for Qt 6.5.2:

libxcb-icccm4
libxcb-image
libxcb-keysyms
libxcb-render_util
libxcb-xinerama
libxcb-xkb
plus:
libxkbcommon-X11

I ran into problems installing these with apt (it couldn't find the first one), but the Synaptic application @JoeCFD mentioned worked fine.

sudo apt install synaptic

Thanks to everyone for the help.

Christian Ehrlicher

@mzimmers said in Qt installation is missing libxcb:

Do I need to install libxcb myself?

Yes

If so, should I just download it from freedesktop?

No, with your package manager.

JoeCFD

@mzimmers said in Qt installation is missing libxcb:

WSL2

Try to install it. Which version do you select if you download it?

I am using a free version of vmWare Player at home. It may be better.

mzimmers

@Christian-Ehrlicher said in Qt installation is missing libxcb:

No, with your package manager.

OK, thanks. apt-cache search libxcb returns a long list of libraries -- how do I determine which I want? This command:

sudo apt-get install libxcb
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package libxcb

didn't work.

I can provide the list if helpful.

EDIT:

I'm guessing it's probably one of these two:

libxcb-icccm4 - utility libraries for X C Binding -- icccm
libxcb-icccm4-dev - utility libraries for X C Binding -- icccm, development files

JonB

@mzimmers
I'm not sure those icccm4 names ring a bell for me under Ubuntu at least?
You might start looking at the list in https://doc.qt.io/qt-6/linux-requirements.html. (Though whatever I/others install is not nearly as long as the complete list there.)
The bits required for libxcb have been asked about so often for various platforms, you could search posts here about libxcb and which named packages people installed.

JoeCFD

@JonB "error while loading shared libraries: libxcb-icccm.so" clearly shows what is missing.

install libxcb-icccm4.

JonB

@JoeCFD LOL, I didn't look at the error message :)
[You should restore your post. I think you were correct :) ]

JoeCFD

@JonB I restored it after I made sure I have this one in my computer.

mzimmers

@JoeCFD I tried that command, and I get the same "package not found" error.

I'm looking at the list on the page that @JonB referenced. I don't want one of the -dev packages, though, do I?

EDIT:

This page returned a long list, too, but might the first entry be the one I want?

JoeCFD

@mzimmers -dev has include files which you do not need. You need them only when your app uses these libs directly. Therefore, install libxcb-icccm4 is good enough.

run command:
locate libxcb-icccm.so

to see if it is installed and where it is located.

mzimmers

@JoeCFD said in Qt installation is missing libxcb:

@mzimmers -dev has include files which you do not need. You need them only when your app use these libs directly.

OK, that's what I thought...thanks. Though I will need to build my own Qt libraries from source (this is ultimately for an embedded system), so I guess eventually I will need one of those.

run command:
locate libxcb-icccm.so

to see if it is installed and where it is located.

That command returned nothing (which I expected).

I imagine that one of the packages returned in the search above is what I want; I just don't know which one.

JoeCFD

@mzimmers
is your OS Ubuntu?
If yes, run
sudo synaptic
click find icon and type libxcb-icccm4
you will be able to see it. Then select it and install. You can see if it is installed or not.

mzimmers

@JoeCFD handy stuff to know...thanks.

So, after I installed libxcb_icccm4, I got a similar error for _image, then for _keysyms. I can go through these one at a time, but...is there a "superset" package that will save me the work?

JoeCFD

@mzimmers Maybe it is better to install them one after another. Otherwise, you may install a lot of things which are not needed.

mzimmers

For anyone who may happen to need this information, here are the xcb libraries I needed for Qt 6.5.2:

libxcb-icccm4
libxcb-image
libxcb-keysyms
libxcb-render_util
libxcb-xinerama
libxcb-xkb
plus:
libxkbcommon-X11

I ran into problems installing these with apt (it couldn't find the first one), but the Synaptic application @JoeCFD mentioned worked fine.

sudo apt install synaptic

Thanks to everyone for the help.