gnu: Add r-bsgenome-celegans-ucsc-ce6.

* gnu/packages/bioinformatics.scm (r-bsgenome-celegans-ucsc-ce6): New
  variable.

gnu/packages/bioinformatics.scm

@@ -4831,6 +4831,38 @@ by UCSC (hg19, February 2009) and stored in Biostrings objects.")
 provided by UCSC (mm9, July 2007) and stored in Biostrings objects.")
     (license license:artistic2.0)))
 
+(define-public r-bsgenome-celegans-ucsc-ce6
+  (package
+    (name "r-bsgenome-celegans-ucsc-ce6")
+    (version "1.4.0")
+    (source (origin
+              (method url-fetch)
+              ;; We cannot use bioconductor-uri here because this tarball is
+              ;; located under "data/annotation/" instead of "bioc/".
+              (uri (string-append "http://www.bioconductor.org/packages/"
+                                  "release/data/annotation/src/contrib/"
+                                  "BSgenome.Celegans.UCSC.ce6_"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "0mqzb353xv2c3m3vkb315dkmnxkgczp7ndnknyhpgjlybyf715v9"))))
+    (properties
+     `((upstream-name . "BSgenome.Celegans.UCSC.ce6")))
+    (build-system r-build-system)
+    ;; As this package provides little more than a very large data file it
+    ;; doesn't make sense to build substitutes.
+    (arguments `(#:substitutable? #f))
+    (propagated-inputs
+     `(("r-bsgenome" ,r-bsgenome)))
+    (home-page
+     "http://www.bioconductor.org/packages/BSgenome.Celegans.UCSC.ce6/")
+    (synopsis "Full genome sequences for Worm")
+    (description
+     "This package provides full genome sequences for Caenorhabditis
+elegans (Worm) as provided by UCSC (ce6, May 2008) and stored in Biostrings
+objects.")
+    (license license:artistic2.0)))
+
 (define-public r-motifrg
   (package
     (name "r-motifrg")