Linux: Comment installer DBD::Pg module?

Postgres DB est déjà installé. Je ne suis pas en utilisant le système de perl, j'ai installé un autre perl dans "/srv/data203806/Migration/CPAN/localperl/bin". Lorsque j'essaie d'installer, Il est demander pour le CHEMIN VERS pg_config:

[[email protected] bin]# ./cpan install DBD::Pg
Reading '/root/.cpan/Metadata'
  Database was generated on Fri, 07 Mar 2014 03:53:02 GMT
Running install for module 'DBD::Pg'
Running make for T/TU/TURNSTEP/DBD-Pg-3.0.0.tar.gz
Checksum for /root/.cpan/sources/authors/id/T/TU/TURNSTEP/DBD-Pg-3.0.0.tar.gz ok

  CPAN.pm: Building T/TU/TURNSTEP/DBD-Pg-3.0.0.tar.gz

    Configuring DBD::Pg 3.0.0
    Path to pg_config?
    No POSTGRES_HOME defined, cannot find automatically
    Warning: No success on command[/srv/data203806/MUXmh-Migration/CPAN/localperl/bin/perl Makefile.PL]
    'YAML' not installed, will not store persistent state
      TURNSTEP/DBD-Pg-3.0.0.tar.gz
      /srv/data203806/MUXmh-Migration/CPAN/localperl/bin/perl Makefile.PL -- NOT OK
    Running make test
      Make had some problems, won't test
    Running make install
      Make had some problems, won't install
    Could not read metadata file. Falling back to other methods to determine prerequisites

Merci de m'aider à installer DBD::Pg? Comment obtenir le chemin d'accès à pg_config?