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-rw-r--r--pkgs/applications/science/chemistry/pymol/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/chemistry/pymol/default.nix b/pkgs/applications/science/chemistry/pymol/default.nix
index 4ad0380ef1e..15a1e315823 100644
--- a/pkgs/applications/science/chemistry/pymol/default.nix
+++ b/pkgs/applications/science/chemistry/pymol/default.nix
@@ -48,7 +48,7 @@ python3Packages.buildPythonApplication rec {
 
   nativeBuildInputs = [ qt5.wrapQtAppsHook ];
   buildInputs = [ python3Packages.numpy python3Packages.pyqt5 glew glm libpng libxml2 freetype msgpack netcdf ];
-  NIX_CFLAGS_COMPILE = "-I ${libxml2.dev}/include/libxml2";
+  env.NIX_CFLAGS_COMPILE = "-I ${libxml2.dev}/include/libxml2";
   hardeningDisable = [ "format" ];
 
   installPhase = ''