Created attachment 4227
add link against lm
since libpng dropped -lm from pkg-config, it's needed in exo. Attached patch does that.
This had already been fixed in master. I cherry-picked the commit into the xfce-4.8 branch. BTW, the author of the fix in master was you. ;)
Author: Yves-Alexis Perez <email@example.com>
Date: Thu Sep 8 10:26:33 2011 +0200
Add missing -lm.
Libpng removed -lm so we need to include this ourselfs.