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-rw-r--r--pkgs/applications/graphics/gnuclad/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/graphics/gnuclad/default.nix b/pkgs/applications/graphics/gnuclad/default.nix
index 0ac22106b98..b90735d8508 100644
--- a/pkgs/applications/graphics/gnuclad/default.nix
+++ b/pkgs/applications/graphics/gnuclad/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     sha256 = "0ka2kscpjff7gflsargv3r9fdaxhkf3nym9mfaln3pnq6q7fwdki";
   };
 
-  NIX_CFLAGS_COMPILE = lib.optional stdenv.cc.isGNU "-Wno-error=catch-value";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-Wno-error=catch-value";
 
   nativeBuildInputs = [ pkg-config ];