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-rw-r--r--pkgs/development/libraries/gtk-frdp/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/gtk-frdp/default.nix b/pkgs/development/libraries/gtk-frdp/default.nix
index 5a42b66ed9d..450fdc6024d 100644
--- a/pkgs/development/libraries/gtk-frdp/default.nix
+++ b/pkgs/development/libraries/gtk-frdp/default.nix
@@ -44,10 +44,10 @@ stdenv.mkDerivation rec {
     };
   };
 
-  env.NIX_CFLAGS_COMPILE = lib.optionals stdenv.isDarwin [
+  env.NIX_CFLAGS_COMPILE = toString (lib.optionals stdenv.isDarwin [
     "-DTARGET_OS_IPHONE=0"
     "-DTARGET_OS_WATCH=0"
-  ];
+  ]);
 
   meta = with lib; {
     homepage = "https://gitlab.gnome.org/GNOME/gtk-frdp";