Installing software using yum

I tried to install trac software on my fedora machine using,

yum install trac

It gve me the following error

[root@charithhost charith]# yum install trac

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

Resolving Dependencies

--> Running transaction check

---> Package trac.noarch 0:0.10.5-1.fc9 set to be updated

--> Processing Dependency: subversion >= 1.1 for package: trac

--> Processing Dependency: python-clearsilver >= 0.9.3 for package: trac

--> Running transaction check

---> Package subversion.i386 0:1.4.6-7 set to be updated

--> Processing Dependency: perl(URI) >= 1.17 for package: subversion

---> Package trac.noarch 0:0.10.5-1.fc9 set to be updated

--> Processing Dependency: python-clearsilver >= 0.9.3 for package: trac

--> Running transaction check

---> Package perl-URI.noarch 0:1.35-8.fc9 set to be updated

---> Package trac.noarch 0:0.10.5-1.fc9 set to be updated

--> Processing Dependency: python-clearsilver >= 0.9.3 for package: trac

--> Finished Dependency Resolution

trac-0.10.5-1.fc9.noarch from updates-newkey has depsolving problems

  --> Missing Dependency: python-clearsilver >= 0.9.3 is needed by package trac-0.10.5-1.fc9.noarch (updates-newkey)

Error: Missing Dependency: python-clearsilver >= 0.9.3 is needed by package trac-0.10.5-1.fc9.noarch (updates-newkey)

Then I tried to install python-clearsilver using yum,

yum install python-clearsilver 

Out put as follows

[root@charithhost charith]# yum install python-clearsilver

Loaded plugins: refresh-packagekit

Setting up Install Process

Parsing package install arguments

No package python-clearsilver available.

Nothing to do

Then I tried with following,

yum search clearsilver

It gave me following results

[root@charithhost charith]# yum search clearsilver

Loaded plugins: refresh-packagekit

fedora                                                   | 2.4 kB     00:00    

Not using downloaded repomd.xml because it is older than what we have

Warning: No matches found for: clearsilver

No Matches found

So I clean yum cache using,

yum clean all

So finally, I was able to run 

yum install trac