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-rw-r--r--pkgs/tools/graphics/appleseed/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/graphics/appleseed/default.nix b/pkgs/tools/graphics/appleseed/default.nix
index d45c28528e72..cafe0bb7b11a 100644
--- a/pkgs/tools/graphics/appleseed/default.nix
+++ b/pkgs/tools/graphics/appleseed/default.nix
@@ -24,7 +24,7 @@ in stdenv.mkDerivation rec {
     osl seexpr makeWrapper
   ];
 
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = toString [
     "-I${openexr.dev}/include/OpenEXR"
     "-I${ilmbase.dev}/include/OpenEXR"
     "-I${openimageio.dev}/include/OpenImageIO"