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-rw-r--r--pkgs/development/python-modules/pystemmer/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/pystemmer/default.nix b/pkgs/development/python-modules/pystemmer/default.nix
index 77c3fa2b2ef..0df510e0b55 100644
--- a/pkgs/development/python-modules/pystemmer/default.nix
+++ b/pkgs/development/python-modules/pystemmer/default.nix
@@ -39,7 +39,7 @@ buildPythonPackage rec {
     export PYSTEMMER_SYSTEM_LIBSTEMMER="${lib.getDev libstemmer}/include"
   '';
 
-  NIX_CFLAGS_COMPILE = [
+  env.NIX_CFLAGS_COMPILE = toString [
     "-I${lib.getDev libstemmer}/include"
   ];