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-rw-r--r--nixpkgs/pkgs/development/libraries/opencv/tests.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/libraries/opencv/tests.nix b/nixpkgs/pkgs/development/libraries/opencv/tests.nix
index 03a89db0882f..d1966b1a4aa8 100644
--- a/nixpkgs/pkgs/development/libraries/opencv/tests.nix
+++ b/nixpkgs/pkgs/development/libraries/opencv/tests.nix
@@ -39,7 +39,7 @@ let
     "stitching"
     "video"
   ] ++ lib.optionals (!stdenv.isAarch64 && enableGStreamer) [ "gapi" ];
-  testRunner = if stdenv.isDarwin then "" else "${lib.getExe xvfb-run} -a ";
+  testRunner = lib.optionalString (!stdenv.isDarwin) "${lib.getExe xvfb-run} -a ";
   testsPreparation = ''
     touch $out
     # several tests want a write access, so we have to copy files