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-rw-r--r--pkgs/applications/misc/opencpn/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/applications/misc/opencpn/default.nix b/pkgs/applications/misc/opencpn/default.nix
index 357f4fcd87e56..313f61e28ce02 100644
--- a/pkgs/applications/misc/opencpn/default.nix
+++ b/pkgs/applications/misc/opencpn/default.nix
@@ -117,9 +117,9 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [ "-DOCPN_BUNDLE_DOCS=true" ];
 
-  NIX_CFLAGS_COMPILE = lib.optionals (!stdenv.hostPlatform.isx86) [
+  env.NIX_CFLAGS_COMPILE = toString (lib.optionals (!stdenv.hostPlatform.isx86) [
     "-DSQUISH_USE_SSE=0"
-  ];
+  ]);
 
   postInstall = lib.optionals stdenv.isDarwin ''
     mkdir -p $out/Applications