Unsolved Required XCB version
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Hi
Can anyone confirm the minimum required xcb version for Qt 5.12.0?The following page suggests 1.8.1 is required
http://doc.qt.io/qt-5/linux-requirements.html
but when I try to configure it on Suse 12.2 (which has 1.8.1) I get this in the configure output suggesting 1.9 is required.
- /usr/bin/pkg-config --exists --silence-errors xcb '>=' 1.9
The configure then fails with this message.
ERROR: Feature 'xcb' was enabled, but the pre-condition 'features.thread && libs.xcb' failed.
Thanks
Bob S. -
Hi and welcome to devnet,
Taking a quick look at the README in the xcb plugin sources, you're right, it's even 1.9.1.
Using
-qt-xcb
might help. -
Thanks for the response.
I should have mentioned originally that I am using the -qt-xcb confiugre option already.
Seems like a good reason for me to stop supporting legacy SuSE 12.2 systems.
Bob S. -
I've recently upgraded from Qt 4.8 to 5.13. I've sucessfully built QT5 on a CentOS7 linux machine running devtoolset-7 but encounter the same error on a CentOS6 box (again, with devtoolset-7).
./configure --prefix=/home/jv/QT5 -opensource -confirm-license -qt-xcb
gives:
ERROR: Feature 'xcb' was enabled, but the pre-condition 'features.thread && features.xkbcommon && libs.xcb' failed.
Check config.log for details.Have looked through config.log and find no xkbcommon or thread references. Indeed, no "errors" around xcb.
Looking at the requirements from here https://doc.qt.io/qt-5/linux-requirements.html my system appears to met the requirements.
Can you tell me which libraries /header files configure thinks are wrong or can't find?
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Hi and welcome to devnet,
Do you have the libxkbcommon development package installed ?
You can also find more information about your current error by passing the-v
option to configure and by looking at the test .logs. -
These are the "xcb" packages I have installed:
Package xorg-x11-xkb-utils-7.7-12.el6.x86_64 already installed and latest version
Package xkeyboard-config-2.16-1.el6.noarch already installed and latest version
Package xorg-x11-xkb-extras-7.7-12.el6.x86_64 already installed and latest versionI'm sorry, I've possibly wasted your time. It appears that libxkbcommon is actually a package but is not available OOTB via yum install libxkbcommon. I will attempt to aquire this package.
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Download the src rpm from ftp://ftp.pbone.net/mirror/ftp5.gwdg.de/pub/opensuse/repositories/home%3A/jayvdb%3A/Qt5/CentOS_6/src/libxkbcommon-0.8.3-63.1.src.rpm . configure, make and install. I now have /usr/local/include/xkbcommon and /usr/local/lib/libxkbcommon*
Same error message. So, exactly what is configure looking for? Perhaps an include or a shared .so library that I have in an unusual place in my system. Trouble is, unless I know what things configure can't find/is unhappy about there isn't much I can do about it.
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I don't think configure will look into /usr/local/lib for system libraries (I might be wrong though).
As I already suggested, did you add the
-v
option when calling configure ?
Did you check the test logs to see where it failed exactly ?If not already, you should always call configure again from a clean state. For that to be easy, please use an out of source build so you can easily nuke it in case of trouble and you keep the sources clean.
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Thanks very much for the advise. It appears that configure seems to remember too much and even though /usr/bin/pkg-config --modversion xkbcommon reported the correct version , configure didn't see that. Delete config.cache and it worked! I did add a symbolic link from /usr/local/lib/pkgconfig/*.pc to /usr/lib64/pkgconfig as pkg-config doesn't search /usr/local/lib by default.
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@jverdicchio said in Required XCB version:
It appears that configure seems to remember too much
Once it is done, the configure script shows a warning message stating that you shall cleanup before calling it again in the same folder.