$XML::Simple::PREFERRED_PARSER = 'XML::Parser';

[download]
would be more straightforward and less error-prone than 
$ENV{XML_SIMPLE_PREFERRED_PARSER} = 'XML::Parser';

[download]

Whichever method you use, it doesn't need to be done before the module is loaded; just before XMLin is called. Safer: 

use XML::Simple qw( XMLin );

sub parse_xml {
   local $XML::Simple::PREFERRED_PARSER = 'XML::Parser';
   return XMLin(@_);
}

my $xml = parse_xml(...);

[download]

In reply to Re^2: After compiling a script using PAR::Packer I get the error Can't locate XML/LibXML/SAX.pm in @INC by ikegami
in thread After compiling a script using PAR::Packer I get the error Can't locate XML/LibXML/SAX.pm in @INC by Anonymous Monk

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