use InstallerHandleTie;
select STDERR; $| = 1;	# make unbuffered
select STDOUT; $| = 1;	# make unbuffered    

my $gfh = *STDOUT;
my $geh = *STDERR;
for (1, 2) {
   local *STDOUT;
   local *STDERR;
   my $outfile = "globlog_$_.txt";
   open LOGFILE, ">$outfile";

   tie *STDOUT, 'InstallerHandleTie', *LOGFILE, $gfh;
   tie *STDERR, 'InstallerHandleTie', *LOGFILE, $geh;
   print "STDOUT in $outfile\n";
   warn "STDERR in $outfile\n";
   untie *STDOUT;
   untie *STDERR;
   close LOGFILE;
}
print "outside of tie loop, I should not be in a log file\n";
warn "outside warning - not in log\n";