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-rw-r--r--nixpkgs/pkgs/build-support/fetchbzr/builder.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/build-support/fetchbzr/builder.sh b/nixpkgs/pkgs/build-support/fetchbzr/builder.sh
index 991864719a07..4515e0e82f49 100644
--- a/nixpkgs/pkgs/build-support/fetchbzr/builder.sh
+++ b/nixpkgs/pkgs/build-support/fetchbzr/builder.sh
@@ -1,4 +1,4 @@
-if [ -e .attrs.sh ]; then source .attrs.sh; fi
+if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
 source "$stdenv/setup"
 
 echo "exporting \`$url' (revision $rev) into \`$out'"