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my @files = qw(
  [%libprefix%]foo[%libsuffix%]
  Foo[%exesuffix%]
  foo[%batsuffix%]
);

my %params = (
  unix => {
...
} elsif ($platform eq 'AIX') {
  %real_param = (%{$param{unix}}, %{$param{aix}});
} # ...