#!/usr/local/bin/perl
use strict ;
use warnings ;
use Compress::Zlib ;
binmode STDOUT; # gzopen only sets it on the fd
#my $gz = gzopen(\*STDOUT, "wb")
my $gz = gzopen('-', "wb")
          or die "Cannot open stdout: $gzerrno\n" ;
while (<>) {
    $gz->gzwrite($_)
        or die "error writing: $gzerrno\n" ;
}
$gz->gzclose ;