If you want to CONVERT your document to PDF before sending them by email. Or 
creating the receipt with a stamp (great ledger analytical )
You have to
1. define the variable
GENERATE_PDF to YES
OFFICE' to 'HOME=/tmp unoconv' 
2. Install the convert library for manipulating image
3. Install pdftk to manage the PDF
4. To fix the broken PDF (slower), install also /usr/bin/ps2pdf

For creating PDF file nothing must be install