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  1. or download this
    > perl
print "Data::Dumper exists\n" if %Data::Dumper::;
> perl -MData::Dumper
print "Data::Dumper exists\n" if %Data::Dumper::;
Data::Dumper exists
  2. or download this
    if (%HTML::Template::) {
  # HTML::template stuff
} else {
  # Regular HTML stuff
}
  3. or download this
    if (exists ${%HTML::Template::}{'import'}) {
  ...
}