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-rw-r--r--pkgs/development/interpreters/io/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/io/default.nix b/pkgs/development/interpreters/io/default.nix
index 0777fb8d48b..8a6de1f094d 100644
--- a/pkgs/development/interpreters/io/default.nix
+++ b/pkgs/development/interpreters/io/default.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation {
   '';
 
   # for gcc5; c11 inline semantics breaks the build
-  NIX_CFLAGS_COMPILE = "-fgnu89-inline";
+  env.NIX_CFLAGS_COMPILE = "-fgnu89-inline";
 
   meta = with lib; {
     description = "Io programming language";