guilherme@debian:[~]: grep -m1 -e version $(which reply)
version 0.35

guilherme@debian:[~]: md5sum $(which reply)
4187760e3097dd0d0e68eab89a043c6f  /usr/bin/reply

guilherme@debian:[~]: file $(which reply)
/usr/bin/reply: Perl script, ASCII text executable

guilherme@debian:[~]: dpkg -S $(which reply)
libreply-perl: /usr/bin/reply

guilherme@debian:[~]: apt-cache show $(echo $(dpkg -S $(which reply))|
+cut                                                                  
+                       -d: -f1)
Package: libreply-perl
Version: 0.35-1
Installed-Size: 196
Maintainer: Debian Perl Group <pkg-perl-maintainers@lists.alioth.debia
+n.org>
Architecture: all
Depends: perl, libconfig-ini-reader-ordered-perl, libdevel-lexalias-pe
+rl, libeva                                                           
+                             l-closure-perl (>= 0.11), libfile-homedi
+r-perl, libmodule-runtime-perl, libpacka                             
+                                                           ge-stash-p
+erl, libpadwalker-perl, libtry-tiny-perl
Suggests: libapp-nopaste-perl, libb-keywords-perl, libcarp-always-perl
+, libclass                                                           
+                             -refresh-perl, libdata-dump-perl, libdat
+a-printer-perl, libmro-compat-perl, libp                             
+                                                           roc-invoke
+editor-perl, libterm-readline-gnu-perl
Description-en: lightweight extensible Perl REPL
 Reply ("read, eval, print, loop, yay!") is a lightweight, extensible 
+REPL for
 Perl. It is plugin-based (see Reply::Plugin), and through plugins sup
+ports
 many advanced features such as coloring and pretty printing, readline
 support, and pluggable commands.
 .
 NOTE: This is an early release, and implementation details of this mo
+dule are
 still very much in flux. Feedback is welcome!
Description-md5: d625336bcf21da688357d76480cd6070
Homepage: https://metacpan.org/release/Reply
Tag: devel::lang:perl, devel::library, implemented-in::perl
Section: perl
Priority: optional
Filename: pool/main/libr/libreply-perl/libreply-perl_0.35-1_all.deb
Size: 83562
MD5sum: 98770e9cf54c5b3566eb272739904279
SHA1: 0fa6baec41dfc19dede44ab73ff230c3448cf4e5
SHA256: 0cd536376f11068191dea6fbbd287e7ff01451c3263702990f5e6cf8d94f18
+12
[download]

Hello guiwp,

This is very strange - I can see for certain that --cfg option is available in reply-0.35 and it even worked on my latest install with --cfg. So, I'm not sure what the problem is with your install -- can you check with your debian package maintainer?

My test cases were:
1. I've noted that if I just run reply without arguments and in its shell type "use mymodule" it just works fine.
2. If I run any installed module (reply -M Data::Dumper) works fine
Maybe somehow my module/script is interfering with the logic of the reply... I'll comment out some lines and see if things change.

Here is header of my simple module:

    #!/usr/bin/env perl
    package Wik;

    use v5.20.2;
    use strict;
    use warnings;
    use open qw/:std :utf8/;
    use utf8;

    use MediaWiki::Bot qw(:constants);
    use Data::Dumper;
    use YAML::Tiny;
    use Path::Tiny qw(path);
    use Getopt::Long;
    use HTTP::Date;
    use Pod::Usage;
    use URI::Escape;

    require Exporter;
    our $VERSION = 0.2;
    our @ISA     = qw(Exporter);
    our @EXPORT  = qw(login savepages updatepages);
[download]

Thank you @robby_dobby, I'll dig in my little code and try to see if I'm doing something wrong...