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-rw-r--r--nixpkgs/lib/attrsets.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/lib/attrsets.nix b/nixpkgs/lib/attrsets.nix
index 31fddc59e20e..812521ce6d1c 100644
--- a/nixpkgs/lib/attrsets.nix
+++ b/nixpkgs/lib/attrsets.nix
@@ -487,7 +487,7 @@ rec {
        => "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev"
   */
   getOutput = output: pkg:
-    if pkg.outputUnspecified or false
+    if ! pkg ? outputSpecified || ! pkg.outputSpecified
       then pkg.${output} or pkg.out or pkg
       else pkg;