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open TEMP,"cleartool checkout -nc $element_pathname 2>&1 |"
    or die "Failed to checkout: $!";
# Read from TEMP as usual, but now we also have STDERR

use IPC::Open3;
my $pid = open3 IGNORE,TEMPOUT,TEMPERR,
    'cleartool',"checkout -nc $element_pathname"
...
}
# Don't forget to reap it!
waitpid $pid,0;