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-rw-r--r--pkgs/misc/screensavers/xscreensaver/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/misc/screensavers/xscreensaver/default.nix b/pkgs/misc/screensavers/xscreensaver/default.nix
index 5af46251a35ba..ea8ba9d042bcb 100644
--- a/pkgs/misc/screensavers/xscreensaver/default.nix
+++ b/pkgs/misc/screensavers/xscreensaver/default.nix
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
   ];
 
   # "marbling" has NEON code that mixes signed and unsigned vector types
-  env.NIX_CFLAGS_COMPILE = lib.optional stdenv.hostPlatform.isAarch "-flax-vector-conversions";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isAarch "-flax-vector-conversions";
 
   postInstall = ''
     for bin in $out/bin/*; do