I need to ask you for advice, how can I prevent my host from problems with Gentoo like that: Some time ago media-libs/jpeg-mmx library was removed from portage. Unfortunately, during upgrades I wasn't noticed about that. My steps during update are: emerge --sync emerge --metadata emerge -uND world ldconfig revdep-rebuild Recently I started to use gstreamer for my new project. Unfortunately, some of the image encoders refused to work with error message: Wrong JPEG library version: library is 62, caller expects 80 I went to /usr/lib and did ls -la|grep libjpeg, the output was: -rw-r--r-- 1 root root 256950 Oct 8 2006 libjpeg-mmx.a -rw-r--r-- 1 root root 493 Oct 8 2009 libjpeg-mmx.la lrwxrwxrwx 1 root root 21 Oct 8 2006 libjpeg-mmx.so -> libjpeg-mmx.so.62.0.0 lrwxrwxrwx 1 root root 21 Oct 8 2006 libjpeg-mmx.so.62 -> libjpeg-mmx.so.62.0.0 -rwxr-xr-x 1 root root 169000 Oct 8 2006 libjpeg-mmx.so.62.0.0 -rw-r--r-- 1 root root 333102 Apr 1 09:22 libjpeg.a -rw-r--r-- 1 root root 914 Apr 1 09:22 libjpeg.la lrwxrwxrwx 1 root root 16 Apr 1 09:22 libjpeg.so -> libjpeg.so.8.0.1 lrwxrwxrwx 1 root root 16 Apr 1 09:22 libjpeg.so.8 -> libjpeg.so.8.0.1 -rwxr-xr-x 1 root root 242864 Apr 1 09:22 libjpeg.so.8.0.1 this libjpeg-mmx.so.62.0.0 seemed suspicious for me. So I went to /var/db/pkg to grep through all CONTENTS files and I found that there's a package called jpeg-mmx to which there's no ebuild in portage anymore. So I unmerged this (with warning that this is important library) and started gstreamer launcher. It ended with new error: (gst-launch-0.10:13360): GStreamer-WARNING **: Failed to load plugin '/usr/lib/gstreamer-0.10/libgstjpeg.so': libjpeg-mmx.so.62: cannot open shared object file: No such file or directory Now situation (and solution) is clear. Reproducible: Always Steps to Reproduce: 1. upgrade old gentoo machine 2. try to use gstreamer 3. ...well, you won't be able to reproduce that the way I did it, as I used gstreamer to stream live image from Player/Stage system which is not in the portage; I was using smokeenc which caused problems with libgstjpeg.so Actual Results: problems as described Expected Results: no problems This is not the first bug related to mysterious "Wrong JPEG library version" message. I guess my problem description may be interesting for others.
uh, having the old jpeg-mmx installed would break number of packages, many of them from media-* categories. that's why it was masked and removed from portage more than 3 years ago per bug 156373. it's not worth the trouble to hunt them down anymore. you should just use emerge --depclean to get rid of these old stray libs
