only pass experimental-features onces to nix-build

pkgs/clan-cli/clan_cli/nix.py

@@ -8,7 +8,7 @@ from .dirs import nixpkgs_flake, nixpkgs_source
 
 
 def nix_command(flags: list[str]) -> list[str]:
-    return ["nix", "--experimental-features", "nix-command flakes"] + flags
+    return ["nix", "--extra-experimental-features", "nix-command flakes"] + flags
 
 
 def nix_build(
@@ -20,8 +20,6 @@ def nix_build(
                 "build",
                 "--no-link",
                 "--print-out-paths",
-                "--extra-experimental-features",
-                "nix-command flakes",
             ]
         )
         + flags

pkgs/clan-cli/default.nix

@@ -89,7 +89,7 @@ let
     ln -s ${nixpkgs} $out/path
     nix flake lock $out \
       --store ./. \
-      --experimental-features 'nix-command flakes' \
+      --extra-experimental-features 'nix-command flakes' \
       --override-input nixpkgs ${nixpkgs}
   '';
 in