Description of problem:

 It seems that the sunbird package is broken:

# yum install sunbird
Loaded plugins: langpacks, presto, refresh-packagekit
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package sunbird.x86_64 0:1.0-0.33.b2pre.fc15 will be installed
--> Processing Dependency: libnotify.so.1()(64bit) for package: sunbird-1.0-0.33.b2pre.fc15.x86_64
--> Finished Dependency Resolution
Error: Package: sunbird-1.0-0.33.b2pre.fc15.x86_64 (fedora)
           Requires: libnotify.so.1()(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest


#locate libnotify | grep .so
/usr/lib64/libnotify.so.4

]# yum info sunbird
Loaded plugins: langpacks, presto, refresh-packagekit
Available Packages
Name        : sunbird
Arch        : x86_64
Version     : 1.0
Release     : 0.33.b2pre.fc15
Size        : 17 M
Repo        : fedora
Summary     : Calendar application built upon Mozilla toolkit
URL         : http://www.mozilla.org/projects/calendar/sunbird/
License     : MPLv1.1 or GPLv2+ or LGPLv2+
Description : Mozilla Sunbird is a cross-platform calendar application, built
            : upon Mozilla Toolkit. It brings Mozilla-style ease-of-use to your
            : calendar, without tying you to a particular storage solution.