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\newif\ifpdf
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\ifx\pdfoutput\undefined
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\pdffalse % we are not running PDFLaTeX
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\else
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\pdfoutput=1 % we are running PDFLaTeX
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\pdftrue
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\fi
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% Then use your new variable \ifpdf
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% \ifpdf
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% \usepackage[pdftex]{graphicx}
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% \pdfcompresslevel=9
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% \else
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% \usepackage{graphicx}
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% \fi
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