gnu: Add r-gridbase.

* gnu/packages/statistics.scm (r-gridbase): New variable.

gnu/packages/statistics.scm

@@ -1305,3 +1305,20 @@ disk (or a connection).")
      "This package provides lots of plotting, various labeling, axis and color
 scaling functions for R.")
     (license license:gpl2+)))
+
+(define-public r-gridbase
+  (package
+    (name "r-gridbase")
+    (version "0.4-7")
+    (source (origin
+              (method url-fetch)
+              (uri (cran-uri "gridBase" version))
+              (sha256
+               (base32
+                "09jzw4rzwf2y5lcz7b16mb68pn0fqigv34ff7lr6w3yi9k91i1xy"))))
+    (build-system r-build-system)
+    (home-page "http://cran.r-project.org/web/packages/gridBase")
+    (synopsis "Integration of base and grid graphics")
+    (description
+     "This package provides an integration of base and grid graphics for R.")
+    (license license:gpl2+)))