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-rw-r--r--scripts/download-using-manifests.pl.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/download-using-manifests.pl.in b/scripts/download-using-manifests.pl.in
index fe80bc11f3a7..4ae24067b3d5 100644
--- a/scripts/download-using-manifests.pl.in
+++ b/scripts/download-using-manifests.pl.in
@@ -295,7 +295,7 @@ sub downloadFile {
     $ENV{"PRINT_PATH"} = 1;
     $ENV{"QUIET"} = 1;
     my ($hash, $path) = `$binDir/nix-prefetch-url '$url'`;
-    die "download of `$url' failed" unless $? == 0;
+    die "download of `$url' failed" . ($! ? ": $!" : "") unless $? == 0;
     chomp $path;
     return $path;
 }