Merge pull request #123081 from stephank/fix-elan-darwin

elan: fix darwin build

pkgs/applications/science/logic/elan/default.nix

···
 { stdenv, lib, runCommand, patchelf, makeWrapper, pkg-config, curl
-, openssl, gmp, zlib, fetchFromGitHub, rustPlatform }:
+, openssl, gmp, zlib, fetchFromGitHub, rustPlatform, libiconv }:
 
 let
   libPath = lib.makeLibraryPath [ gmp ];
···
   nativeBuildInputs = [ pkg-config makeWrapper ];
 
   OPENSSL_NO_VENDOR = 1;
-  buildInputs = [ curl zlib openssl ];
+  buildInputs = [ curl zlib openssl ]
+    ++ lib.optional stdenv.isDarwin libiconv;
 
   cargoBuildFlags = [ "--features no-self-update" ];