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-rw-r--r--guix/build-system/asdf.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/guix/build-system/asdf.scm b/guix/build-system/asdf.scm
index f043e6a7a2..a0f4634db0 100644
--- a/guix/build-system/asdf.scm
+++ b/guix/build-system/asdf.scm
@@ -151,7 +151,8 @@ set up using CL source package conventions."
name))
(define (has-from-build-system? pkg)
- (eq? from-build-system (package-build-system pkg)))
+ (and (package? pkg)
+ (eq? from-build-system (package-build-system pkg))))
(define (find-input-package pkg)
(let* ((name (package-name pkg))