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+_________________
+The iftex package
+v0.1
+
+This very simple package, for both Plain TeX and LaTeX,
+defines the \ifPDFTeX, \ifXeTeX, and \ifLuaTeX boolean
+for testing whether PDFTeX, or XeTeX, or LuaTeX is being
+used for typesetting.
+
+Also provides the \RequirePDFTeX, \RequireXeTeX, and \RequireLuaTeX
+command which throws an error if PDFTeX, XeTeX and LuaTeX (respectively)
+is not the engine in use.
+
+
+______________
+Vafa Khalighi
+vafakh84@gmail.com
+
+Copyright 2010
+Distributed under the LaTeX Project Public License