Merge staging-next into staging

pkgs/development/tools/rust/cargo-feature/default.nix

@@ -1,4 +1,4 @@
-{ lib, rustPlatform, fetchFromGitHub }:
+{ lib, rustPlatform, fetchFromGitHub, stdenv, libiconv }:
 
 rustPlatform.buildRustPackage rec {
   pname = "cargo-feature";
@@ -13,6 +13,8 @@ rustPlatform.buildRustPackage rec {
 
   cargoSha256 = "1jh1h6v4mxx03b4diw9325ga0k3js0czs504lx07hvbx8yai1wkq";
 
+  buildInputs = lib.optional stdenv.isDarwin libiconv;
+
   meta = with lib; {
     description = "Allows conveniently modify features of crate";
     homepage = "https://github.com/Riey/cargo-feature";