Look at the use of 'package'. I believe that all variables and subroutines are defined by package.
One way to do what you want is name your code as 'package something.pm'. Since your using require to bring the script into your main package, load your package via 'use' at the beginning of execution, and then loop on the require part which will include calls to your subroutines for building the user's script. I would also put the loop in an 'eval'.
Other Perl Monks will have more experience with 'package' (hint: you need it for CPAN). I've only used it once or twice.
"Well done is better than well said." - Benjamin Franklin
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