I work with Windows XP and Strawberry Perl Portable Edition version 5.14.2. This is my 1st attempt to learn how to use Module::Build. I use a start script and a module. Their code looks as follows:

use strict;
use warnings;
use feature 'say';
use Mymoddir::Mymod;
our $VERSION = v0.0.1;

say 'start mymain';
my $answ = Mymoddir::Mymod::mysub('hello');
say "mysub returned: $answ";
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-----

use strict;
use warnings;
use feature 'say';

package Mymoddir::Mymod;
our $VERSION = v0.0.1;
sub mysub {
    say 'mysub got: ', shift;
    return 'thanks';
}
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The file structure for "perl Build.PL" is

build_distrib\Mydistro\script\mymain.pl
build_distrib\Mydistro\lib\Mymoddir\Mymod.pm
build_distrib\Build.PL
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Build.PL reads

use 5.006;
use strict;
use warnings;
use Module::Build;

my $distro = 'Mydistro';   # Name of Distribution
my $builder = Module::Build->new(
    dist_name           => "$distro",
    dist_version        => '0.000_001',
    module_name         => "$distro/lib/Mymoddir/Mymod",
    license             => 'perl',
    dist_author         => q{GUIfriend<KWittrock@cpan.org>},
    dist_abstract       => 'Greetings',
    build_requires => {
        'Test::More' => 0,
    },
    requires => {
        'perl' => 5.006,
    },
    add_to_cleanup      => [ "$distro-*" ],
    create_makefile_pl  => 'traditional',
);
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I took the template of Build.PL from an earlier attempt to use Module::Starter::Smart (for a more complex program). Without the "module_name" parameter I get a warning

No 'module_name' was provided and it could not be inferred
from other properties.  This will prevent a packlist from
being written for this file.  Please set either 'module_name'
or 'dist_version_from' in Build.PL.
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After "Build dist" MANIFEST contains

Build.PL
MANIFEST            This list of files
Mydistro/lib/Mymoddir/Mymod.pm
Mydistro/script/mymain.pl
Makefile.PL
META.yml
META.json
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and that's what the tarball contains.

For a test installation, I unpack the tarball to

%tmp%\sudo\inst_mat
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and then use the commands

cd /d %tmp%\sudo\inst_mat\Mydistro-0.000_001
perl Build.PL --destdir ..\..\sudodir verbose=1
Build
Build install
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There is only one file in the installation

%tmp%\sudo\sudodir\strawberry5.14\perl\site\lib\auto\Mydistro\lib\Mymo
+ddir\Mymod\.packlist
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... and it is empty. I don't get an error message.

I do hope that someone can tell me what I'm doing wrong.

Kind regards

GUIfriend