gnu: Add texlive-metaplot.

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

gnu/packages/tex.scm

@@ -5514,6 +5514,30 @@ (define-public texlive-metaobj
 @code{rboxes.mp}.  It is easily extensible with new objects.")
     (license license:lppl)))
 
+(define-public texlive-metaplot
+  (package
+    (name "texlive-metaplot")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/metaplot/" "metapost/metaplot/")
+             (base32
+              "19y8lj28gvky7f7g2i562ixwvmnxnflnfc8l8r0x7zg384hg8835")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (home-page "https://ctan.org/pkg/metaplot")
+    (synopsis "Plot-manipulation macros for use in MetaPost")
+    (description
+     "MetaPlot is a set of MetaPost macros for manipulating pre-generated
+plots (and similar objects), and formatting them for inclusion in a MetaPost
+figure.  The intent is that the plots can be generated by some outside
+program, in an abstract manner that does not require making decisions about
+on-page sizing and layout, and then they can be imported into MetaPlot and
+arranged using the full capabilities of MetaPost.  Metaplot also includes
+a very flexible set of macros for generating plot axes, which may be useful in
+other contexts as well.")
+    (license license:lppl)))
+
 (define-public texlive-natbib
   (package
     (name "texlive-natbib")