1 files changed, 11 insertions(+), 1 deletions(-)

M guix/build-system/r.scm

@@ 28,7 28,8 @@
   #:use-module (srfi srfi-26)
   #:export (%r-build-system-modules
             r-build
-            r-build-system))
+            r-build-system
+            cran-uri))
 
 ;; Commentary:
 ;;


@@ 36,6 37,15 @@
 ;;
 ;; Code:
 
+(define (cran-uri name version)
+  "Return a list of URI strings for the R package archive on CRAN for the
+release corresponding to NAME and VERSION.  As only the most recent version is
+available via the first URI, the second URI points to the archived version."
+  (list (string-append "mirror://cran/src/contrib/"
+                       name "_" version ".tar.gz")
+        (string-append "mirror://cran/src/contrib/Archive/"
+                       name "/" name "_" version ".tar.gz")))
+
 (define %r-build-system-modules
   ;; Build-side modules imported by default.
   `((guix build r-build-system)