gnu: Add texlive-elpres.

* gnu/packages/tex.scm (texlive-elpres): New variable.

gnu/packages/tex.scm

@@ -80314,6 +80314,28 @@ (define-public texlive-elmath
 ISO 8859-7 encoding) in math mode.")
     (license license:lppl)))
 
+(define-public texlive-elpres
+  (package
+    (name "texlive-elpres")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/elpres/" "tex/latex/elpres/")
+             (base32
+              "0mx36x88rcgjga1pqqf0rnyyq81lc4728gzjkp2scwz26yn6b6zv")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (home-page "https://ctan.org/pkg/elpres")
+    (synopsis "Simple class for electronic presentations")
+    (description
+     "The @code{elpres} class is intended to be used for presentations on a screen
+or with a beamer/projector.  It is derived from LaTeX's @code{article} class
+and can be used with with LaTeX, pdfLaTeX, and LuaLaTeX.  The default
+``virtual paper size'' of presentations generated by this class corresponds to
+a 4:3 (width:height) aspect ratio.  Other aspect ratios for widescreen
+monitors (16:9, 16:10) may be selected.")
+    (license license:lppl)))
+
 ;;;
 ;;; Avoid adding new packages to the end of this file. To reduce the chances
 ;;; of a merge conflict, place them above by existing packages with similar