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Luatex 0.80 is compatible with pdflatex so uses the same back end files for most driver-specific functions. As your log shows: (/usr/local/texlive/2015/texmf-dist/tex/latex/hyperref/hpdftex.def The pdftex hyperef file is used. To avoid the warning simply do not use the package, it is not needed, and does nothing very useful, for pdftex or luatex. For ...
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