I would like to use special characters as the german umlaute ä, ö, ü, etc. (also ß) in the source file in plain TeX as I may use them in LaTeX using \usepackage[utf8]{inputenc}. The use of \input utf8-pl and typesetting with plain TeX leads to the error message "The encTeX extension of TeX is not found“. Is there a way to circumvent this problem? I am using TeXShop Version 3.75 on a MacBook Air with macOS Sierra (Version 10.12.1) and encTeX is apparently part of TeXShop.
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xetexorluatex? – Henri Menke Nov 28 '16 at 16:58