An effed up Perl configuration

gistfile1.txt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
[bhall@moana][~]> module list
Currently Loaded Modulefiles:
  1) rocks-openmpi
[bhall@moana][~]> echo $PERL5LIB

[bhall@moana][~]> echo $PERL5INC

[bhall@moana][~]> echo $INC

[bhall@moana][~]> module load perl/5.14.2 
[bhall@moana][~]> echo $PERL5LIB
/data0/opt/perl/perl-5.14.2/cpan/lib/site_perl/5.14.2/
[bhall@moana][~]> echo $INC

[bhall@moana][~]> echo $PERL5INC

[bhall@moana][~]> which perl
/data0/opt/perl/perl-5.14.2/bin/perl
[bhall@moana][~]> which cpan
/data0/opt/perl/perl-5.14.2/bin/cpan
[bhall@moana][~]> cpan List::Util 
CPAN: Storable loaded ok (v2.27)
Going to read '/export/cpan/cpan/Metadata'
  Database was generated on Fri, 29 Aug 2014 00:17:02 GMT
CPAN: LWP::UserAgent loaded ok (v6.04)
CPAN: Time::HiRes loaded ok (v1.972101)
Warning: You are not allowed to write into directory "/export/cpan/cpan/sources/authors".
    I'll continue, but if you encounter problems, they may be due
    to insufficient permissions.
Fetching with LWP:
ftp://cpan-du.viaverio.com/pub/CPAN/authors/01mailrc.txt.gz
Can't write to '/export/cpan/cpan/sources/authors/01mailrc.txt.gz.tmp23539-23539': Permission denied at /opt/perl/lib/site_perl/5.14.2/LWP/Protocol.pm line 105. at /opt/perl/lib/site_perl/5.14.2/LWP/UserAgent.pm line 915.
[bhall@moana][~]> cpan -J
$CPAN::Config = {
                  'cpan_home' => '/export/cpan/cpan',
                  'histfile' => '/export/cpan/cpan/histfile',
                  'unzip' => '/usr/bin/unzip',
                  'show_upload_date' => '0',
                  'yaml_load_code' => '0',
                  'lynx' => '',
                  'curl' => '/usr/bin/curl',
                  'ncftp' => '',
                  'urllist' => [
                                 'ftp://cpan-du.viaverio.com/pub/CPAN/',
                                 'ftp://cpan-sj.viaverio.com/pub/CPAN/',
                                 'ftp://cpan.erlbaum.net/CPAN/',
                                 'ftp://cpan.hexten.net/',
                                 'ftp://cpan.llarian.net/pub/CPAN/',
                                 'ftp://cpan.mirrors.tds.net/pub/CPAN',
                                 'ftp://cpan.netnitco.net/pub/mirrors/CPAN/',
                                 'ftp://cpan.pair.com/pub/CPAN/',
                                 'ftp://cpan.uchicago.edu/pub/CPAN/',
                                 'ftp://ftp-mirror.internap.com/pub/CPAN/'
                               ],
                  'keep_source_where' => '/export/cpan/cpan/sources',
                  'yaml_module' => 'YAML',
                  'prefer_installer' => 'MB',
                  'no_proxy' => '',
                  'build_cache' => '100',
                  'wget' => '/usr/bin/wget',
                  'auto_commit' => '1',
                  'patch' => '/usr/bin/patch',
                  'inactivity_timeout' => '0',
                  'scan_cache' => 'atstart',
                  'halt_on_failure' => '0',
                  'cache_metadata' => '1',
                  'term_ornaments' => '1',
                  'build_dir_reuse' => '0',
                  'perl5lib_verbosity' => 'v',
                  'load_module_verbosity' => 'v',
                  'mbuild_install_arg' => '',
                  'check_sigs' => '1',
                  'build_dir' => '/export/cpan/cpan/build',
                  'index_expire' => '1',
                  'test_report' => '0',
                  'pager' => '/usr/bin/less',
                  'http_proxy' => '',
                  'makepl_arg' => '',
                  'show_unparsable_versions' => '0',
                  'version_timeout' => '15',
                  'mbuild_install_build_command' => './Build',
                  'gzip' => '/bin/gzip',
                  'trust_test_report_history' => '0',
                  'ncftpget' => '',
                  'build_requires_install_policy' => 'yes',
                  'connect_to_internet_ok' => '1',
                  'getcwd' => 'cwd',
                  'make_install_make_command' => '/usr/bin/make',
                  'prefer_external_tar' => '1',
                  'make_arg' => '',
                  'ftp_proxy' => '',
                  'ftp_passive' => '1',
                  'tar' => '/bin/tar',
                  'use_sqlite' => '0',
                  'mbuildpl_arg' => '',
                  'show_zero_versions' => '0',
                  'ftp' => '/usr/kerberos/bin/ftp',
                  'prefs_dir' => '/export/cpan/cpan/prefs',
                  'shell' => '/bin/bash',
                  'prerequisites_policy' => 'follow',
                  'make' => '/usr/bin/make',
                  'gpg' => '/usr/bin/gpg',
                  'mbuild_arg' => '',
                  'applypatch' => '',
                  'inhibit_startup_message' => '0',
                  'commandnumber_in_prompt' => '1',
                  'bzip2' => '/usr/bin/bzip2',
                  'tar_verbosity' => 'v',
                  'make_install_arg' => '',
                  'term_is_latin' => '1',
                  'histsize' => '100',
                  'colorize_output' => '0'
                };

1;
__END__

From line 35 on, I can't figure out where these settings are stored. I'd like to change 'build_dir', for example.