[root@lnx80 ~]# perl -e 'print join("\n",@INC)'
/usr/local/lib64/perl5
/usr/local/share/perl5
/usr/lib64/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib64/perl5
/usr/share/perl5

# perl -MFile::Find=find -MFile::Spec::Functions -Tlwe 'find { wanted => sub { print canonpath $_ if /\.pm\z/ }, no_chdir => 1 }, @INC'

# perldoc -l DBI
/usr/opt/perl5/lib/site_perl/5.28.1/aix-thread-multi/DBI.pm

[root@fedora ~]# pmall
Encode (3.19) - character encodings in Perl
Clone (0.46) - recursively copy Perl datatypes
Storable (3.26) - persistence for Perl data structures
Cwd (3.84) - get pathname of current working directory
DBI (1.643) - Database independent interface for Perl
Socket (2.036) - networking constants and support functions
Term::ReadKey (2.38) - A perl module for simple terminal control
Sub::Util (1.63) - A selection of utility subroutines for subs and CODE references
IO::Compress::Brotli (0.004001) - Write Brotli buffers/streams
IO::Uncompress::Brotli (0.004001) - Read Brotli buffers/streams
Digest::SHA (6.04) - Perl extension for SHA-1/224/256/384/512
...

root@aixtest:/root > /opt/freeware/bin/cpan
o conf init /proxy/
 <ftp_proxy>
Your ftp_proxy? [] w.x.y.z:<port>

 <http_proxy>
Your http_proxy? [] w.x.y.z:<port>
http://10.10.10.10:8080/

 <no_proxy>
Your no_proxy? [] w.x.y.z:<port>

Proxy userID ?

Proxy password ?

o conf commit

root@aixtest:/root > perl –MCPAN –e'install <module_name>' 

Or

root@aixtest:/root > cpan Devel::PPPort

Dependencies between modules can be found in CPAN site

Error downloading with HTTP::Tiny: Not a CODE reference

Set the proxy also

export http_proxy="http://user:pass@proxyserver:8080"
export https_proxy="http://user:pass@proxyserver:8080"
export ftp_proxy="http://user:pass@proxyserver:8080"

https://community.ibm.com/community/user/power/blogs/jan-harris1/2022/03/21/aix-open-source-support-tips

Answer

AIX does not set maxdata because it causes issues for AIX Perl-based commands.

One of the following solutions can usually resolve the issue:

1) Use the 64-bit module

2) export LDR_CNTRL=MAXDATA=0x80000000@DSA

3) Use a perl.rpm version (which is recommended for reasons that are listed in the AIX Perl Updates and Support for perl.rte technote), then use ldedit to permanently set the maxdata value

# ldedit -b maxdata=0x80000000 "path to perl.rpm Perl binary" 

https://www.cpan.org/modules/01modules.index.html