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-rw-r--r--pkgs/build-support/fetchhg/builder.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchhg/builder.sh b/pkgs/build-support/fetchhg/builder.sh
index 1ce29475771..20dfde4b10d 100644
--- a/pkgs/build-support/fetchhg/builder.sh
+++ b/pkgs/build-support/fetchhg/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 "getting $url${rev:+ ($rev)} into $out"