CentOS 5 will not show PNG icons, errors when X starts.
 

This is related to remote desktop over VNC. I'm not sure if this should be posted in the Desktop or Server section. I'm sure a mod will move this if necessary.

In short, the problem is that CentOS 5 won't recognize PNG files. There are a few errors about it when X starts. The end result is that icons in PNG format don't show up on the desktop or in the menus. I tried re-installing gtk2 and libpng but with no success.

Here are 4 related errors that show when X is started:

AFAIK libpng12 should reside in /usr/lib/ and not /usr/local/lib/. So what did you do that makes this a non-standard install of that library and does one reside in /usr/lib?

Thanks for your reply. When I saw the problem for the first time, I did:

libpng is not in /usr/lib

Can you post what 'rpm -qf /usr/local/lib/libpng12.so.0' returns? And 'rpm -ql $(rpm -qf /usr/local/lib/libpng12.so.0)'? Do you by any chance export a LD_LIBRARY_PATH ?

[root@server ~]# rpm -qf /usr/local/lib/libpng12.so.0
file /usr/local/lib/libpng12.so.0 is not owned by any package

[root@server ~]# rpm -ql $(rpm -qf /usr/local/lib/libpng12.so.0)
/usr/bin/file
/usr/include/magic.h
/usr/lib/libmagic.a
/usr/lib/libmagic.so
/usr/lib/libmagic.so.1
/usr/lib/libmagic.so.1.0.0
/usr/share/doc/file-4.17
/usr/share/doc/file-4.17/LEGAL.NOTICE
/usr/share/doc/file-4.17/README
/usr/share/file
/usr/share/file/magic
/usr/share/file/magic.mgc
/usr/share/file/magic.mime
/usr/share/file/magic.mime.mgc
/usr/share/magic
/usr/share/magic.mime
/usr/share/man/man1/file.1.gz
/usr/share/man/man3/libmagic.3.gz
/usr/share/man/man5/magic.5.gz
/usr/share/misc/magic
package /usr/local/lib/libpng12.so.0 is not installed
package is is not installed
package not is not installed
package owned is not installed
package by is not installed
package any is not installed
package package is not installed

Not quite sure what you mean by that, but will give you info if you explain how.

Like I said before libpng12.so resides in /usr/lib, not /usr/local/lib, so this kind of confirms what I thought: your /usr/local/lib/libpng12.so.0 isn't installed by RPM. Question now is how it got there and if you need it. BTW existing LD_LIBRARY_PATH should be visible by just doing 'echo $LD_LIBRARY_PATH' unless set only in some startup script. Then, and only if that something is running, running something like 'find /proc/ -maxdepth 1 -name environ | xargs -iX grep -a LD_LD_LIBRARY_PATH 'X' ' could show.

I have no idea why it installed, like that. I just used yum.

Shows nothing.

I'm unclear about the second command you mentioned. Should I just run it or do I need to check start-up scripts first?

The message "file /usr/local/lib/libpng12.so.0 is not owned by any package" means that it is not part of a package the RPMDB (/var/lib/rpm/.*) knows about. Ergo it was not installed using either 'rpm' directly or 'yum'. While I haven't booted my F12 to confirm, libpng is centric to the system (meaning it should reside in /usr/lib.*) and not a local addition (which the FSSTND or FHS or whatever standard is current will tell you should go in /usr/local/.*).


You can run it NP or check SysV init scripts first. Your call. In the end, if there is no documented use for the library and:
0) LD_LIBRARY_PATH doesn't export /usr/local/lib, and
1) no currently running process uses /usr/local/lib/libpng12.so.0 ('/usr/sbin/lsof -Pwn | grep '/usr/local/lib/libpng';'), and
2) /etc/ld.so.conf.d/ doesn't include a file that covers /usr/local/lib ('grep -r '/usr/local/' /etc/ld.so.conf.d/') and
3) ldconfig doesn't show any ('/sbin/ldconfig -p|grep '/usr/local/lib/libpng';'),
then you could rename the library before deciding to (make a backup and) remove it.

After that install libpng with yum (unless 'locate libpng' already shows it to reside in /usr/lib), run ldconfig, run prelink (if applicable) and test.

It was just blank, liked it showed.

Would a symbolic link work to resolve the path issue?

If you remain adamant doing things "the right way" doesn't apply to you then all I can say is it may or may not work. End of thread for me.

Then does anyone else have an idea about the right way to install libpng? Installing with yum seems to place it in the wrong directory.