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-rw-r--r--pkgs/development/libraries/opencv/4.x.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/opencv/4.x.nix b/pkgs/development/libraries/opencv/4.x.nix
index 4a9af9a5388..ac021c2b610 100644
--- a/pkgs/development/libraries/opencv/4.x.nix
+++ b/pkgs/development/libraries/opencv/4.x.nix
@@ -307,7 +307,7 @@ stdenv.mkDerivation {
     pythonPackages.setuptools
   ];
 
-  NIX_CFLAGS_COMPILE = lib.optionalString enableEXR "-I${ilmbase.dev}/include/OpenEXR";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString enableEXR "-I${ilmbase.dev}/include/OpenEXR";
 
   # Configure can't find the library without this.
   OpenBLAS_HOME = lib.optionalString withOpenblas openblas_.dev;