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-rw-r--r--guix/build/download.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/guix/build/download.scm b/guix/build/download.scm
index 65d18eb839..ae59b0109c 100644
--- a/guix/build/download.scm
+++ b/guix/build/download.scm
@@ -231,7 +231,8 @@ host name without trailing dot."
(resolve-interface '(web client))
'current-http-proxy))
(parameterize ((current-http-proxy #f))
- (when (getenv "https_proxy")
+ (when (and=> (getenv "https_proxy")
+ (negate string-null?))
(format (current-error-port)
"warning: 'https_proxy' is ignored~%"))
(thunk))