I looked into it, but I´m afraid it does not quite serve my purpose.

Look up :) AssertOS is in the CheckOS distribution ... Devel::CheckOS - check what OS we're running on ... this mean it doesn't die

So then

package System::Scaller;
use Module::Load qw/ load /;
use Devel::CheckOS qw/ os_is /;
my @targets = (
  [qw/ AIX  System::Scanner::AIX  /],
  [qw/ RHEL System::Scanner::Linux::RHEL  /],
  [qw/ SUSE System::Scanner::Linux::SUSE  /],
);
for my $targ ( @targets ){
    my( $name, $module ) = @_;
    if( os_is( $name ) ){
        load $module;
        @System::Scaller::ISA = $module;
        last;
    }
}

1;
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You install everything, you only load the module thats appropriate for the platform

Hacking Makefiles and only packing certain files is PITA, avoid it