How to fix yum install perl-DBI No package perl-DBI available. Nothing to do

I wanted to install perl-DBI which is a dependency of git-1.7.3.4-1.el5.rf.i386.rpm

when I wanted to install git-1.7.3.4-1.el5.rf.i386.rpm by running

yum install git-core
or even running
rpm -i git-1.7.3.4-1.el5.rf.i386.rpm
it prompted me with a notice that

Error: Missing Dependency: perl(DBI) is needed by package git-1.7.3-1.el4.rf.i386 (rpmforge)

THe fix is so easy
just go to the file /etc/yum.conf using a text editor such as nano

nano /etc/yum.conf

then remove perl*
save the file by existing using CTRL+x and confirming to save changes
run yum install git-core again

finally you should see this notification

Total download size: 6.1 M
Is this ok [y/N]: y
Downloading Packages:
(1/2): perl-Git-1.7.3.4-1.el5.rf.i386.rpm                                                                                                        |  24 kB     00:00
(2/2): git-1.7.3.4-1.el5.rf.i386.rpm                                                                                                             | 6.1 MB     00:01
---------------------------------------------------------------------------------------------------------------
Total                                                                                                                                   2.3 MB/s | 6.1 MB     00:02
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing     : git                                                                                                                                              1/2
Installing     : perl-Git                                                                                                                                         2/2

Installed:
git.i386 0:1.7.3.4-1.el5.rf

Dependency Installed:
perl-Git.i386 0:1.7.3.4-1.el5.rf

Complete!