[SOLVED] qt-creator could not find or load the Qt platform plugin xcb ?

sierdzio · wrote on 2 Aug 2013, 16:44

I think it's a good candidate for posting on a wiki. Care to update "the guide":http://qt-project.org/wiki/Building_Qt_5_from_Git yourself or should I do it? I think a lot of people can benefit from your description - questions about building on CentOS are rather frequent.

EdOfTheMountain · wrote on 2 Aug 2013, 17:03

Sure, I'll take a stab at it.

Thanks!

EdOfTheMountain · wrote on 2 Aug 2013, 17:13

I changed my mind. Can you please update the guide for me?

It was not clear to me how you would edit an existing wiki article without damaging existing content. I am used to MediaWiki.

Thanks!

-Ed

sierdzio · wrote on 3 Aug 2013, 08:06

OK no problem, I'll do it right away.

Edit: done.

Lugaxx · wrote on 19 Nov 2013, 14:12

EdOfTheMountain's guide doesn't work for me.

[quote author="EdOfTheMountain" date="1375458145"]
make
[/quote]

@.obj/moc_qqmlvaluetype_p.o: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
make[3]: *** [../../lib/libQt5Qml.so.5.2.0] Error 1
make[3]: Leaving directory /opt/sw/qt5/qt5/qtdeclarative/src/qml' make[2]: *** [sub-qml-make_first-ordered] Error 2 make[2]: Leaving directory /opt/sw/qt5/qt5/qtdeclarative/src'
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory `/opt/sw/qt5/qt5/qtdeclarative'
make: *** [module-qtdeclarative-make_first] Error 2@

alphabit · wrote on 9 Apr 2014, 00:19

Hi guys,

I followed the steps listed but with yesterday's source and on centos 6.4 and everything works fine, except for the mouse scroll wheel. I VNC into the box that qt-creator compiled and installed from sources, but VNC or no VNC, the scrollwheel just doesn't work. I recompiled Qt and Qt-Creator a number of times but still no go. I have all the xcb packages installed but the scrollwheel just doesn't work. Did anyone experience this issue?

Thanks

sierdzio · wrote on 9 Apr 2014, 05:54

No, I have not had that problem. Check out the configure output: maybe there are some hints there.

alphabit · wrote on 9 Apr 2014, 17:38

I checked the output and didn't find anything out of the norms. Let me post the output here, maybe your eyes may find something.

@
Configure summary

Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
Platform notes:

        - Also available for Linux: linux-kcc linux-icc linux-cxx

Build options:
Configuration .......... accessibility accessibility-atspi-bridge alsa audio-backend avx avx2 clock-gettime clock-monotonic compile_examples concurrent dbus evdev eventfd fontconfig full-config getaddrinfo getifaddrs glib iconv inotify ipv6ifname large-config largefile linuxfb medium-config minimal-config mremap nis no-harfbuzz opengl openssl pcre png posix_fallocate precompile_header pulseaudio qpa qpa reduce_exports reduce_relocations release rpath shared small-config sse2 sse3 sse4_1 sse4_2 ssse3 system-freetype system-jpeg system-zlib xcb xcb-glx xcb-plugin xcb-render xcb-sm xcb-xlib xinput2 xkbcommon-qt xlib xrender
Build parts ............ libs tools
Mode ................... release
Using C++11 ............ no
Using PCH .............. yes
Target compiler supports:
SSE2/SSE3/SSSE3 ...... yes/yes/yes
SSE4.1/SSE4.2 ........ yes/yes
AVX/AVX2 ............. yes/yes

Qt modules and options:
Qt D-Bus ............... yes (loading dbus-1 at runtime)
Qt Concurrent .......... yes
Qt GUI ................. yes
Qt Widgets ............. yes
Large File ............. yes
QML debugging .......... yes
Use system proxies ..... no

Support enabled for:
Accessibility .......... yes
ALSA ................... yes
CUPS ................... no
FontConfig ............. yes
FreeType ............... yes (system library)
Glib ................... yes
GTK theme .............. no
HarfBuzz ............... no
Iconv .................. yes
ICU .................... no
Image formats:
GIF .................. yes (plugin, using bundled copy)
JPEG ................. yes (plugin, using system library)
PNG .................. yes (in QtGui, using bundled copy)
journald ............... no
mtdev .................. no
Networking:
getaddrinfo .......... yes
getifaddrs ........... yes
IPv6 ifname .......... yes
OpenSSL .............. yes (loading libraries at run-time)
NIS .................... yes
OpenGL / OpenVG:
EGL .................. no
OpenGL ............... desktop
OpenVG ............... no
PCRE ................... yes (bundled copy)
pkg-config ............. yes
PulseAudio ............. yes
QPA backends:
DirectFB ............. no
EGLFS ................ no
KMS .................. no
LinuxFB .............. yes
XCB .................. yes (system library)
EGL on X ........... no
GLX ................ yes
MIT-SHM ............ yes
Xcb-Xlib ........... yes
Xcursor ............ yes (loaded at runtime)
Xfixes ............. yes (loaded at runtime)
Xi ................. no
Xi2 ................ yes
Xinerama ........... yes (loaded at runtime)
Xrandr ............. yes (loaded at runtime)
Xrender ............ yes
XKB ................ no
XShape ............. yes
XSync .............. yes
XVideo ............. yes
Session management ..... yes
SQL drivers:
DB2 .................. no
InterBase ............ no
MySQL ................ yes (plugin)
OCI .................. no
ODBC ................. no
PostgreSQL ........... yes (plugin)
SQLite 2 ............. no
SQLite ............... yes (plugin, using bundled copy)
TDS .................. no
udev ................... no
xkbcommon .............. yes (bundled copy, XKB config root: /usr/share/X11/xkb)
zlib ................... yes (system library)

NOTE: libxkbcommon and libxkbcommon-x11 0.4.0 or higher not found on the system, will use
the bundled version from 3rd party directory.

Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt will be installed into /usr/local/Qt-5.3.0

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

@

sierdzio · wrote on 9 Apr 2014, 17:47

Looks good to me, too...

alphabit · wrote on 9 Apr 2014, 18:04

Would this qualify as a bug? I can reproduce this everytime on a Centos 6.4 and 6.5.

sierdzio · wrote on 9 Apr 2014, 18:06

Yes, please "report it":https://qt-project.org/wiki/ReportingBugsInQt.

The wiki page is not part of documentation per se, so you can't claim it's a bug because a thing from the docs is not working, but I think it's important to notify the Qt dev that something is wrong.

alphabit · wrote on 24 Apr 2014, 06:34

Hi sierdzio,

Apparently, there is an existing "bug":https://bugreports.qt-project.org/browse/QTBUG-38169 with 5.3beta1, which I am experiencing since I cloned a few days back. I read the bug report and it looks like 5.2.1 was all good. I want to follow the same instructions listed on this post to "build 5.2.1 from source.":http://download.qt-project.org/official_releases/qt/5.2/5.2.1/single/ .Would they work? The file I was hoping to download is qt-everywhere-opensource-src-5.2.1.tar.gz.

Thanks.

sierdzio · wrote on 24 Apr 2014, 07:02

[quote author="alphabit" date="1398321241"]Would they work? The file I was hoping to download is qt-everywhere-opensource-src-5.2.1.tar.gz.Thanks.[/quote]

You need to check yourself. I have seen enough errors on CentOS to try to stay away from that OS as far as possible.

I often build Qt on Kubuntu linux and sometimes on OpenSUSE - there it works without problems, every time.