gnu: Add texlive-tree-dvips.

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

gnu/packages/tex.scm

@@ -12587,6 +12587,31 @@ display calculators, specifically the TI-82 STATS.")
 the @code{tabbing} package.")
     (license license:lppl1.0+)))
 
+(define-public texlive-tree-dvips
+  (package
+    (name "texlive-tree-dvips")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/tree-dvips/" "dvips/tree-dvips/"
+                   "tex/latex/tree-dvips/")
+             (base32
+              "0wk86z29aqfrsg947h5qbp98fngdx55v8xcx6dgniv5fv7d9ffrp")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (home-page "https://ctan.org/pkg/tree-dvips")
+    (synopsis "Trees and other linguists' macros")
+    (description
+     "The package defines a mechanism for specifying connected trees that uses
+a @code{tabular} environment to generate node positions.  The package uses
+PostScript code, loaded by Dvips, so output can only be generated by use of
+Dvips.
+
+The package @code{lingmacros.sty} defines a few macros for linguists:
+@code{\\enumsentence} for enumerating sentence examples, simple
+@code{tabular}-based non-connected tree macros, and gloss macros.")
+    (license license:lppl1.0+)))
+
 (define-public texlive-turnstile
   (package
     (name "texlive-turnstile")