Why not install perl EV?

I install perl EV on CentOS:

wget http://cpan.rinet.ru/authors/id/M/ML/MLEHMANN/EV-4.18.tar.gz
tar xzf EV-4.18.tar.gz
cd EV-4.18
perl Makefile.PL
make install clean

4 step some strange errors in what could be the problem?

I am trying to run dklab_realplexor:

[root@domain dklab_realplexor]# cd /opt/dklab_realplexor/
[root@domain dklab_realplexor]# ./dklab_realplexor.pl
Error: EV library is not found in your system:
http://search.cpan.org/~mlehmann/EV-3.9/EV.pm
You must install EV, e.g.:
# yum install gcc
# perl -MCPAN -e "install EV"
  - or -
# apt-get install gcc
# perl -MCPAN -e "install EV"


Source: linux

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