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-rw-r--r--gnu/services/base.scm23
1 files changed, 12 insertions, 11 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 8449d924af..945b546607 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1718,17 +1718,18 @@ proxy of 'guix-daemon'...~%")
   "Return a file that contains the list of references of ITEM."
   (if (struct? item)                              ;lowerable object
       (computed-file name
-                     (with-imported-modules (source-module-closure
-                                             '((guix build store-copy)))
-                       #~(begin
-                           (use-modules (guix build store-copy))
-
-                           (call-with-output-file #$output
-                             (lambda (port)
-                               (write (map store-info-item
-                                           (call-with-input-file "graph"
-                                             read-reference-graph))
-                                      port)))))
+                     (with-extensions (list guile-gcrypt) ;for store-copy
+                       (with-imported-modules (source-module-closure
+                                               '((guix build store-copy)))
+                         #~(begin
+                             (use-modules (guix build store-copy))
+
+                             (call-with-output-file #$output
+                               (lambda (port)
+                                 (write (map store-info-item
+                                             (call-with-input-file "graph"
+                                               read-reference-graph))
+                                        port))))))
                      #:options `(#:local-build? #f
                                  #:references-graphs (("graph" ,item))))
       (plain-file name "()")))