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-rw-r--r--pkgs/applications/version-management/fnc/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/applications/version-management/fnc/default.nix b/pkgs/applications/version-management/fnc/default.nix
index 8f2d527785d..0167f09ad5b 100644
--- a/pkgs/applications/version-management/fnc/default.nix
+++ b/pkgs/applications/version-management/fnc/default.nix
@@ -13,10 +13,10 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "PREFIX=$(out)" ];
 
-  env.NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
+  env.NIX_CFLAGS_COMPILE = toString (lib.optionals stdenv.cc.isGNU [
     # Needed with GCC 12
     "-Wno-error=maybe-uninitialized"
-  ];
+  ]);
 
   preInstall = ''
     mkdir -p $out/bin