IfeTeX – Provides \ifetex switch

The package provides the switch \ifetex which indicates whether ε-TeX is available or not.

The package can be loaded as LaTeX package using \usepackage{ifetex} or in plain TeX using \input ifetex. In either case it aborts silently if the \ifetex macro is already defined.

The package’s test is whether \eTeXversion is defined as a primitive; if it is, the package assumes ε-TeX features are available.

Please note, that ifetex is now part of iftex.

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