[PATCH] r: make and install info files

[m8r-y0v7u9]

* gnu/packages/statistics.scm (r)[arguments]: make and install info files

diff --git a/gnu/packages/statistics.scm b/gnu/packages/statistics.scm
index 0b9e081..0dfe25d 100644
--- a/gnu/packages/statistics.scm
+++ b/gnu/packages/statistics.scm
@@ -63,7 +63,23 @@
         'check 'set-timezone
         ;; Some tests require the timezone to be set.
         (lambda _ (setenv "TZ" "UTC"))
-        %standard-phases)
+        (alist-cons-after
+         'install 'install-info
+         (lambda* (#:key inputs outputs #:allow-other-keys)
+           ;; Install the Info manual, unless Texinfo is missing.
+           (or (not (assoc-ref inputs "texinfo"))
+               (let ((out (assoc-ref outputs "out")))
+                 (and (zero? (system* "make" "info"))
+                      (let ((infodir (string-append out "/share/info")))
+                        (mkdir-p infodir)
+                        (chdir "./doc/manual")
+                        (for-each (lambda (info)
+                                    (copy-file
+                                     info
+                                     (string-append infodir "/" info)))
+                                  (find-files "." "\\.info$"))
+                        #t)))))
+        %standard-phases))
        #:configure-flags
        '("--with-blas"
          "--with-lapack"