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-rw-r--r--pkgs/stdenv/generic/builder.sh4
1 files changed, 3 insertions, 1 deletions
diff --git a/pkgs/stdenv/generic/builder.sh b/pkgs/stdenv/generic/builder.sh
index a46c46c2db50..42e1a029e584 100644
--- a/pkgs/stdenv/generic/builder.sh
+++ b/pkgs/stdenv/generic/builder.sh
@@ -15,4 +15,6 @@ cat "$setup" >> $out/setup
 # Allow the user to install stdenv using nix-env and get the packages
 # in stdenv.
 mkdir $out/nix-support
-echo $propagatedUserEnvPkgs > $out/nix-support/propagated-user-env-packages
+if [ "$propagatedUserEnvPkgs" ]; then
+    printf '%s ' $propagatedUserEnvPkgs > $out/nix-support/propagated-user-env-packages
+fi