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use strict;
use warnings;
...

system( "mail $address -s '$subject' < blah6.txt" ) == 0
    or die "mail failed:  $?";

Variable "$ID" is not imported at myscript.pl line 137.
Variable "$version" is not imported at myscript.pl line 137.
...
Global symbol "@whatever" requires explicit package name at myscript.p
+l line 154.
Global symbol "@whatever" requires explicit package name at myscript.p
+l line 154.
Execution of myscript.pl aborted due to compilation errors.