From 51bf1c518853badaebc48ac1144e5afd9b5862c2 Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Thu, 5 Sep 2019 22:16:25 +0200
Subject: [PATCH] gnu: Add texlive-iftex.

* gnu/packages/tex.scm (texlive-iftex): New variable.
---
 gnu/packages/tex.scm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 0fdd970dde..b792e72693 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -7166,3 +7166,23 @@ (define-public texlive-pst-text
 a different path and manipulating characters.  It includes the functionality
 of the old package @code{pst-char}.")
       (license license:lppl))))
+
+(define-public texlive-iftex
+  (let ((template (simple-texlive-package
+                   "texlive-iftex"
+                   (list "/doc/generic/iftex/"
+                         "/tex/generic/iftex/iftex.sty")
+                   (base32
+                    "089zvw31gby150n1k0zdk2c0q97pgbqs46phxydaqil64b55nnl7")
+                   #:trivial? #t)))
+    (package
+      (inherit template)
+      (home-page "http://www.ctan.org/pkg/iftex")
+      (synopsis "Determine the currently used TeX engine")
+      (description "This package, which works both for Plain TeX and for
+LaTeX, defines the @code{\\ifPDFTeX}, @code{\\ifXeTeX}, and @code{\\ifLuaTeX}
+conditionals for testing which engine is being used for typesetting.  The
+package also provides the @code{\\RequirePDFTeX}, @code{\\RequireXeTeX}, and
+@code{\\RequireLuaTeX} commands which throw an error if pdfTeX, XeTeX or
+LuaTeX (respectively) is not the engine in use.")
+      (license license:lppl1.3+))))