[Mono-list] Problems on CentOS

[DW]

Hello group,
i just tried to install mono on my CentOS 5. I added the mono.repo file like described in the mono wiki.
here's the output after trying to install mono-core:

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yum install mono-core
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package mono-core.i586 0:1.2.5.1-0.novell set to be updated
--> Running transaction check
--> Processing Dependency: libgdiplus for package: mono-core
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package libgdiplus.i386 0:1.2.5-1.rhel4.novell set to be updated
--> Running transaction check
--> Processing Dependency: libungif.so.4 for package: libgdiplus
--> Processing Dependency: libexif.so.9 for package: libgdiplus
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package giflib.i386 0:4.1.3-7.1.el5.1 set to be updated
--> Running transaction check
--> Processing Dependency: libexif.so.9 for package: libgdiplus
--> Finished Dependency Resolution
Error: Missing Dependency: libexif.so.9 is needed by package libgdiplus
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after searching the libexif.so.98 file i found this for CentOS 4:
http://rpm2html.osmirror.nl/centos/4.3/os/i386/CentOS/RPMS/libexif-0.5.12-5.1.i386.html

but libexif is installed on my system. so what am i missing here?
known problem?

regards

Daniel