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# forks then changes working directory and executes a command
sub chdir_and_system {
...
    wait;
    die "child error $?" if ($?);
}

sub add_gff_track {
    my ( $browser_project_dir, $gff_file, $track_label, $key, @optiona
+l_args )
...
    chdir_and_system( $browser_project_dir, @args );

}