warning deprecated option line-width

[Mehmet Okonsar]

I get this warning:
lilypond-book: warning: deprecated ly-option used: line-width=9cm

what is to be used instead?
I'm using separate files for a latex project so lilypond-book can not 
get the info she needs about the paper size from the file...
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             8 / _ \/   .  .     mehmet okonsar
              | / \| --   pianist-composer-conductor
 
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