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use Base::Module;
Base::Module::Config->import(qw( %conf ));

package Base::Module;

...

  *conf = \%{config_module . '::conf'};
}

use Base::Module qw( %conf );

sub base_module { "Base::Module" }

...
  eval 'require ' . base_module;
  base_module()->import(qw( %conf ));
}