Hi all, I'm primarily trying to use kmess but have found the same problem in using kopete. A lot of the icons are missing and both applications crash. Running them both in the terminal reveals the problem:

in kmess:
in kopete:
I only have one package installed: libpng-1.4.1, although I can see that it contains both of the versions. Both apps crash as a result of this error, curiously each for the opposite reason!

I have tried the kmess slackbuilds from slacky.eu and slackbuilds.org, I have also tried compiling from source myself. I guess I need to force kmess to compile using the newer libpng, although I'm not really sure how to do that..

Thanks,
Tom

The package should have been named libpng-1.2.43+1.4.1 :
It is made from two sources, please see slackware/source/..

Hiding libpng12.pc or libpng14.pc can decide the compiling.
May be create a link from one ? : cd /usr/lib64/pkgconfig/
# ln -s libpng14.pc libpng.pc

It may also be required to hide the ".so" :
cd /usr/lib64/ , # mv libpng12.so libpng12.so-back

.....

There was already the symbolic link between libpng.pc and libpng14.pc. I tried moving the .so file as you said and also moved the libpng12.pc but it still comes up with the same error.

I had the same problem with wxGTK and wxMaxima. The answer was in this ChangeLog, where in the configure script you'll have to replace the deprecated functions with the new ones, and maybe (I don't remember this) force link with -lpng14. Keep an eye on your ./configure log.

The source for kmess has a "configure" script but it's only provided as a compatibility layer. It actually uses cmake. I'm not too sure how cmake works and where you would specify the libpng version, do you know?

Now that you said that, I remember that I didn't have any problem with Kmess... but, I can't help to notice that I have both libpng12 and libpng14.

By the way, mine is Slackware-current i686

What libraries does kmess need ?

I had the same problem with amule. I compiled amule after the libpng
upgrade and i guess it linked with 1.4 png, but my wxGTK was compiled
before the upgrade so i got the same message like yours. Now i have
compiled wxGTK again and the message is gone and icons work fine.

It may be irrelevant but it seems to be the same cause to your problem.

I've sorted it out now..

I've been using the packages from AlienBob and somewhere along the line missed out on a key bit of information. I upgraded to the kde 4.4.1 packages and read that the dependencies were the same as before so I didn't re-download or upgrade any of those. I hadn't realised that there was also a previous update to these dependencies. I also upgraded all the multilib packages, which had also been rebuilt.

I was searching all over the place for things to do with kmess and libpng and didn't realise that the solution was right under my nose . Thanks to everyone that tried to help. Sorry that I didn't mention I was using these packages as well, it was obviously quite relevant!

Note to self: keep an eye on http://alien.slackbook.org/blog/!