First, get rid of Compress::LZF_PP. Second, there's no need to print contents to STDERR. You won't need to. Here's what I used:

#!/usr/bin/perl 

use strict;
use warnings;
use Compress::LZF qw(:compress);


my $contents = q(
A123456789 123456789 123456789 123456789 123456789 123456789
B123456789 123456789 123456789 123456789 123456789 123456789
);
print "-" x 60;

my $compressed = compress($contents);
my $decompressed = decompress($compressed);
print $decompressed;
[download]

Note that Compress::LZF only works with liblzf. In other words, the data must be compressed and decompressed with liblzf exclusively. It won't work with Java-based versions of the algorithm.