ifvtex – Detects use of VTeX and its facilities
The package looks for VTeX and sets the switch \ifvtex. In the presence of VTeX, the mode switches \ifvtexdvi, \ifvtexpdf and \ifvtexps are set; \ifvtexgex tells you whether GeX is operating.
The LaTeX Project Public License 1.3
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examine the TeX programming environment
Maybe you are interested in the following packages as well.
- ifpdf: Provides the \ifpdf conditional
- iftex: Am I running under pdfTeX, XeTeX or LuaTeX?
- ifetex: Provides \ifetex switch
- pdftexcmds: LuaTeX support for pdfTeX utility functions