[1] What does xarinstall do ?
[2] What do I need to compile this ?

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[1] What does xarinstall do ?
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xarinstall does the following:

   - Installs files in a xar-ball.
   - Carries a database of which files you have installed.

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[2] What do I need to compile this ?
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xarinstall dependends upon:

   - xar!
   - sqlite3 (included with darwin since version 8).
   - openssl