XnViewMP 0.35 fails to start

[*Dark Dragon*]

This is what happens when I try to run it:

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% ./xnview.sh
Cannot mix incompatible Qt library (version 0x40702) with this library (version 0x40701)

I use latest Debian Sid with KDE 4.4.5 with 4.7.2 Qt libraries, and downloaded 64-bit version of XnViewMP. Error is obvious but does not include important detail: what library is conflicting exactly? Let's see...

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export QT_PLUGIN_PATH="`pwd`"/lib
export LD_LIBRARY_PATH="`pwd`"/lib
strace ./xnview |& grep -i libqt | grep -v XnViewMP
open("/usr/lib/libQtDBus.so.4", O_RDONLY) = 8

Here it is: /usr/lib/libQtDBus.so.4 that's actually is symbolic link to /usr/lib/libQtDBus.so.4.7.2. But why XnViewMP tries to load it?

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% ldd xnview | grep -i libqt
        libQtWebKitXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtWebKitXn.so.4 (0x00007ffff6818000)
        libQtGuiXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtGuiXn.so.4 (0x00007ffff5894000)
        libQtCoreXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtCoreXn.so.4 (0x00007ffff53dd000)
        libQtSvgXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtSvgXn.so.4 (0x00007ffff4f0c000)
        libQtXmlXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtXmlXn.so.4 (0x00007ffff4cc2000)
        libQtNetworkXn.so.4 => /var/pkgs/xnview/XnViewMP-035/lib/libQtNetworkXn.so.4 (0x00007ffff49bb000)

As you can see, ldd shows that XnViewMP does not require libQtDBus.so.4 at all. Obvious thing to try is to make libQtDBus.so.4 inaccessible for XnViewMP. If I do this, this is what I get:

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% sudo mv /usr/lib/libQtDBus.so.4{,~}
% strace ./xnview |& grep -i libqtdbus | head -n20
open("/var/pkgs/xnview/XnViewMP-035/lib/libQtDBus.so.4", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/libQtDBus.so.4", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib/libQtDBus.so.4", O_RDONLY)   = -1 ENOENT (No such file or directory)
... (last three lines repeat quickly very many times) ...

Important thing is that despite large number of these "errors" XnViewMP runs fine (please note that "errors" are only visible because of strace). It looks like XnViewMP doesn't need libQtDBus.so.4 because if it fails to find it - it works as far as I can tell, but if it finds it - XnViewMP will very likely to fail to work if version of libQtDBus.so.4 isn't 4.7.1.

Short conclusion:
Workarond: if you get "Cannot mix incompatible Qt library" make /usr/lib/libQtDBus.so.4 inaccessible for XnViewMP, it will run and work perfectly as far as I can tell.

Suggested fix: if XnViewMP really don't need libQtDBus.so.4 - make it not to try to load it at all (and XnViewMP definitely should not try to load so many times something that do not exist); for me XnViewMP works perfectly without this library but in case it is needed for something, it should be normal library dependency viewable with ldd and libQtDBus.so.4 should be included in lib directory of XnViewMP package.

[xnview]

Strange that DBus library is needed. Could you send me your email by PM?

[karls0]

Strange that DBus library is needed. Could you send me your email by PM?

Hi Pierre,

I use aptosid and have the same problem. I get "Cannot mix incompatible Qt library (version 0x40703) with this library (version 0x40701)", when I try to start XnViewMP 0.35.

Please publish the solution, as soon as possible.

TIA
Karl

[xnview]

Please publish the solution, as soon as possible.

Please try to uncompress this file in the lib folder of xnview...

[karls0]

Hi Pierre,
sorry forr being away for so long.
I tried to untar the extra-file, but XnViewMP does not start either. When I try to start it from the console, I get

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 root@siduxbox:/usr/local/XnViewMP-035# ./xnview
 ./xnview: error while loading shared libraries: libQtWebKitXn.so.4: cannot open shared object file: No such file or directory

Of course libQtWebKitXn.so.4 exists in /usr/local/XnViewMP-035/lib
Since all files were owned by UID 500, I did a chown to root.staff, which is the same on other files un /usr on my machine. This did not help!
I also tried the ldd-command on xnview and get:

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 root@siduxbox:/usr/local/XnViewMP-035# ldd ./xnview | grep -i libqt
        libQtWebKitXn.so.4 => not found
        libQtGuiXn.so.4 => not found
        libQtCoreXn.so.4 => not found
        libQtSvgXn.so.4 => not found
        libQtXmlXn.so.4 => not found
        libQtNetworkXn.so.4 => not found

Any ideas?

Regards
Karl

[karls0]

Sorry Pierre,
I did not see that 039 is out
Of course I will install it and try it with the new version!

Regards
Karl

[karls0]

The new version works fine - thank You Pierre!

Regards
Karl