The following diff mitigates this build failure for me:
diff --git a/guix/scripts/pull.scm b/guix/scripts/pull.scm
index 0372278705..04970cf503 100644
--- a/guix/scripts/pull.scm
+++ b/guix/scripts/pull.scm
@@ -304,7 +304,7 @@ to display."
(new
(let ((count (length new)))
(format (current-error-port)
- (N_ " ~*One new channel:~%"
+ (N_ " ~a new channel:~%"
" ~a new channels:~%" count)
count)
(for-each display-channel new))))
@@ -314,7 +314,7 @@ to display."
(removed
(let ((count (length removed)))
(format (current-error-port)
- (N_ " ~*One channel removed:~%"
+ (N_ " ~a channel removed:~%"
" ~a channels removed:~%" count)
count)
(for-each display-channel removed))))
