checksetup.pl tell me that I must install VCI module for perl but it is already installed about bugzilla-vcs HOT 2 OPEN

Can you please copy and paste the exact message from checksetup.pl?

I have the same issue... Here's what checksetup.pl returns : 
***********************************************************************
* REQUIRED MODULES                                                    *
***********************************************************************
* Bugzilla requires you to install some Perl modules which are either *
* missing from your system, or the version on your system is too old. *
* See below for commands to install these modules.                    *
***********************************************************************
* OPTIONAL MODULES                                                    *
***********************************************************************
* Certain Perl modules are not required by Bugzilla, but by           *
* installing the latest version you gain access to additional         *
* features.                                                           *
*                                                                     *
* The optional modules you do not have installed are listed below,    *
* with the name of the feature they enable. Below that table are the  *
* commands to install each module.                                    *
***********************************************************************
*      MODULE NAME * ENABLES FEATURE(S)                               *
***********************************************************************
* Apache-SizeLimit * mod_perl                                         *
***********************************************************************
COMMANDS TO INSTALL OPTIONAL MODULES:

Apache-SizeLimit: /usr/bin/perl install-module.pl Apache2::SizeLimit

COMMANDS TO INSTALL REQUIRED MODULES (You *must* run all these commands
and then re-run checksetup.pl):

    /usr/bin/perl install-module.pl VCI

To attempt an automatic install of every required and optional module
with one command, do:

  /usr/bin/perl install-module.pl --all

*** Installation aborted. Read the messages above. ***


================================================================================
================================================================================
bash#  /usr/bin/perl install-module.pl VCI
Checking for                 CPAN (v1.81)     ok: found v2.00 
Checking for                 YAML (any)       ok: found v1.13 
Checking for   ExtUtils-MakeMaker (v6.31)     ok: found v6.66 
CPAN: Storable loaded ok (v2.41)
Reading '/root/.cpan/Metadata'
  Database was generated on Mon, 22 Dec 2014 17:29:02 GMT
Installing VCI version 0.007001...
CPAN: Module::CoreList loaded ok (v2.96)
VCI is up to date (0.7.1).