I upgraded to Slack 11 (upgradepkg --install-new /slackware/*/*.tgz on both discs) today and I'm now unable to run Gaim, XChat, and Firefox. I get the following error:

./firefox-bin: symbol lookup error: /usr/lib/libpango-1.0.so.0: undefined symbol: g_slice_free_chain_with_offset

I was previously getting:

./firefox-bin: symbol lookup error: /usr/lib/libgtk-x11-2.0.so.0: undefined symbol: g_object_compat_control

But I tracked that down to a problem with libgobject.

I'm totally stumped as to how to fix this Pango issue. All the files relating to Pango in /usr/lib look fine.

For what it's worth, here's the output from ldd firefox-bin:

libmozjs.so => /usr/local/firefox/libmozjs.so (0x40036000)
libxpcom.so => /usr/local/firefox/libxpcom.so (0x400a4000)
libxpcom_core.so => not found
libplds4.so => /usr/local/firefox/libplds4.so (0x40145000)
libplc4.so => /usr/local/firefox/libplc4.so (0x40148000)
libnspr4.so => /usr/local/firefox/libnspr4.so (0x4014c000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40178000)
libdl.so.2 => /lib/libdl.so.2 (0x401cc000)
libgtk-x11-2.0.so.0 => /usr/lib/libgtk-x11-2.0.so.0 (0x401d0000)
libgdk-x11-2.0.so.0 => /usr/lib/libgdk-x11-2.0.so.0 (0x404c3000)
libatk-1.0.so.0 => /usr/lib/libatk-1.0.so.0 (0x40543000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/libgdk_pixbuf-2.0.so.0 (0x4055d000)
libpangoxft-1.0.so.0 => /usr/lib/libpangoxft-1.0.so.0 (0x40573000)
libpangox-1.0.so.0 => /usr/lib/libpangox-1.0.so.0 (0x4057b000)
libpango-1.0.so.0 => /usr/lib/libpango-1.0.so.0 (0x40586000)
libgobject-2.0.so.0 => /usr/local/lib/libgobject-2.0.so.0 (0x405c0000)
libgmodule-2.0.so.0 => /usr/local/lib/libgmodule-2.0.so.0 (0x405fa000)
libglib-2.0.so.0 => /usr/local/lib/libglib-2.0.so.0 (0x405fe000)
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40681000)
libm.so.6 => /lib/libm.so.6 (0x4074f000)
libsmime3.so => /usr/local/firefox/libsmime3.so (0x40772000)
libssl3.so => /usr/local/firefox/libssl3.so (0x40792000)
libnss3.so => /usr/local/firefox/libnss3.so (0x407b2000)
libsoftokn3.so => /usr/local/firefox/libsoftokn3.so (0x40815000)
libXrender.so.1 => /usr/X11R6/lib/libXrender.so.1 (0x4087b000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x40885000)
libXt.so.6 => /usr/X11R6/lib/libXt.so.6 (0x408ef000)
libxpcom_compat.so => /usr/local/firefox/libxpcom_compat.so (0x40941000)
libstdc++.so.5 => /usr/i486-slackware-linux/lib/libstdc++.so.5 (0x40958000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40a10000)
libc.so.6 => /lib/libc.so.6 (0x40a19000)
libXft.so.2 => /usr/X11R6/lib/libXft.so.2 (0x40b48000)
libfontconfig.so.1 => /usr/X11R6/lib/libfontconfig.so.1 (0x40b5a000)
/lib/ld-linux.so.2 (0x40000000)
libpangocairo-1.0.so.0 => /usr/lib/libpangocairo-1.0.so.0 (0x40b81000)
libcairo.so.2 => /usr/lib/libcairo.so.2 (0x40b89000)
libXrandr.so.2 => /usr/X11R6/lib/libXrandr.so.2 (0x40bd2000)
libXi.so.6 => /usr/X11R6/lib/libXi.so.6 (0x40bd7000)
libXinerama.so.1 => /usr/X11R6/lib/libXinerama.so.1 (0x40bdf000)
libXcursor.so.1 => /usr/X11R6/lib/libXcursor.so.1 (0x40be2000)
libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x40beb000)
libXfixes.so.3 => /usr/X11R6/lib/libXfixes.so.3 (0x40bf9000)
libpangoft2-1.0.so.0 => /usr/lib/libpangoft2-1.0.so.0 (0x40bff000)
libz.so.1 => /usr/lib/libz.so.1 (0x40c25000)
libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40c37000)
libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x40c40000)
libexpat.so.0 => /usr/lib/libexpat.so.0 (0x40c59000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0x40c79000)

Same problem with Gaim.

gaim: symbol lookup error: /usr/lib/libpango-1.0.so.0: undefined symbol: g_slice_free_chain_with_offset

Output from LDD:

libgtk-x11-2.0.so.0 => /usr/lib/libgtk-x11-2.0.so.0 (0x40036000)
libgdk-x11-2.0.so.0 => /usr/lib/libgdk-x11-2.0.so.0 (0x4032a000)
libatk-1.0.so.0 => /usr/lib/libatk-1.0.so.0 (0x403aa000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/libgdk_pixbuf-2.0.so.0 (0x403c4000)
libpangocairo-1.0.so.0 => /usr/lib/libpangocairo-1.0.so.0 (0x403da000)
libpangoft2-1.0.so.0 => /usr/lib/libpangoft2-1.0.so.0 (0x403e2000)
libpango-1.0.so.0 => /usr/lib/libpango-1.0.so.0 (0x40408000)
libcairo.so.2 => /usr/lib/libcairo.so.2 (0x40443000)
libXrender.so.1 => /usr/X11R6/lib/libXrender.so.1 (0x4048c000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0x40495000)
libfontconfig.so.1 => /usr/X11R6/lib/libfontconfig.so.1 (0x404ce000)
libexpat.so.0 => /usr/lib/libexpat.so.0 (0x404f5000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x40515000)
libz.so.1 => /usr/lib/libz.so.1 (0x40580000)
libgobject-2.0.so.0 => /usr/local/lib/libgobject-2.0.so.0 (0x40592000)
libgmodule-2.0.so.0 => /usr/local/lib/libgmodule-2.0.so.0 (0x405cc000)
libglib-2.0.so.0 => /usr/local/lib/libglib-2.0.so.0 (0x405d0000)
libao.so.2 => /usr/lib/libao.so.2 (0x40653000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40657000)
libdl.so.2 => /lib/libdl.so.2 (0x406ab000)
libaudiofile.so.0 => /usr/lib/libaudiofile.so.0 (0x406af000)
libm.so.6 => /lib/libm.so.6 (0x406d3000)
libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x406f6000)
libXss.so.1 => /usr/X11R6/lib/libXss.so.1 (0x40704000)
libstartup-notification-1.so.0 => /usr/lib/libstartup-notification-1.so.0 (0x40707000)
libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40710000)
libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x40719000)
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40731000)
libnsl.so.1 => /lib/libnsl.so.1 (0x407fe000)
libc.so.6 => /lib/libc.so.6 (0x40814000)
libXrandr.so.2 => /usr/X11R6/lib/libXrandr.so.2 (0x40942000)
libXi.so.6 => /usr/X11R6/lib/libXi.so.6 (0x40947000)
libXinerama.so.1 => /usr/X11R6/lib/libXinerama.so.1 (0x4094f000)
libXcursor.so.1 => /usr/X11R6/lib/libXcursor.so.1 (0x40952000)
libXfixes.so.3 => /usr/X11R6/lib/libXfixes.so.3 (0x4095b000)
/lib/ld-linux.so.2 (0x40000000)

I went so far as to removepkg on gaim as well as delete anything that was left behind and then reinstalled the package.

I did the same for Pango.

I believe the "undefined symbol: g_slice_free_chain_with_offset" error comes from a missing glib2-2.10.3-i486-1 package.

I also see this in your ldd output:
as well as lots of references to "/usr/local/firefox".
The file libxpcom_core.so is contained in Slackware 11.0's firefox, thunderbird and seamonkey packages.

I'd say you messed up and need to clean your porch. This is not a Slackware upgrade problem really.

Eric

I think the problem lies somewhere in the fact that I'd added and removed things from my previous Slackware install.

I ended up just doing a fresh install and moving my backups in and everything's fine.