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-rw-r--r--guix/build/download.scm10
1 files changed, 6 insertions, 4 deletions
diff --git a/guix/build/download.scm b/guix/build/download.scm
index 16afb1dce1..e8d61e0d92 100644
--- a/guix/build/download.scm
+++ b/guix/build/download.scm
@@ -211,10 +211,12 @@ which is not available during bootstrap."
(unless (or (> (string->number (major-version)) 2)
(> (string->number (minor-version)) 0)
(> (string->number (micro-version)) 11))
- (let ((declare-relative-uri-header!
- (module-ref (resolve-module '(web http))
- 'declare-relative-uri-header!)))
- (declare-relative-uri-header! "Location")))
+ (let ((var (module-variable (resolve-module '(web http))
+ 'declare-relative-uri-header!)))
+ ;; If 'declare-relative-uri-header!' doesn't exist, forget it.
+ (when (and var (variable-bound? var))
+ (let ((declare-relative-uri-header! (variable-ref var)))
+ (declare-relative-uri-header! "Location")))))
(define (resolve-uri-reference ref base)
"Resolve the URI reference REF, interpreted relative to the BASE URI, into a