gnu: Add texlive-montex.

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

gnu/packages/tex.scm

@@ -11622,6 +11622,43 @@ the dividend and divisor.")
 alphabet.  (The work derives from the earlier Russian work for Babel.)")
     (license license:lppl)))
 
+(define-public texlive-montex
+  (package
+    (name "texlive-montex")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/montex/"
+                   "fonts/map/dvips/montex/"
+                   "fonts/source/public/montex/"
+                   "fonts/tfm/public/montex/"
+                   "fonts/type1/public/montex/"
+                   "tex/latex/montex/")
+             (base32
+              "01rbzw0kbiy3wig2mrdclygx7a71dckq9rhqj8jpdnbjyhm9jw35")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (native-inputs (list texlive-metafont))
+    (propagated-inputs (list texlive-cbfonts))
+    (home-page "https://ctan.org/pkg/montex")
+    (synopsis "Mongolian LaTeX")
+    (description
+     "MonTeX provides Mongolian and Manju support for the TeX and LaTeX community.
+It provides all necessary characters for writing standard Mongolian in
+Cyrillic and Classical (aka Traditional or Uighur) writing, and Manju as well
+as transliterated Tibetan texts, for which purpose a number of additional
+characters was created.
+
+In MonTeX, both Mongolian and Manju are entered in romanized form.  The
+retransliteration (from Latin input to Mongolian and Manju output) is
+completely realized in TeX and Metafont so that no external preprocessor is
+required.  Please note that most of the enhanced functions of MonTeX require
+a working e-LaTeX environment.  This is especially true when compiling
+documents with Mongolian or Manju as the main document language.  It is
+recommended to choose pdfLaTeX as the resulting PDF files are truly portable.
+Vertical text generated by MonTeX is not supported in DVI.")
+    (license license:gpl3+)))
+
 (define-public texlive-moreverb
   (package
     (name "texlive-moreverb")