nixpkgs/pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix

{ stdenv, appleDerivation }:

appleDerivation {
  preConfigure = "cd libiconv";

  postInstall = ''
    mv $out/lib/libiconv.dylib $out/lib/libiconv-nocharset.dylib
    install_name_tool -id $out/lib/libiconv-nocharset.dylib $out/lib/libiconv-nocharset.dylib

    # re-export one useless symbol; ld will reject a dylib that only reexports other dylibs
    echo 'void dont_use_this(){}' | clang -dynamiclib -x c - -current_version 2.4.0 \
      -compatibility_version 7.0.0 -current_version 7.0.0 -o $out/lib/libiconv.dylib \
      -Wl,-reexport_library -Wl,$out/lib/libiconv-nocharset.dylib \
      -Wl,-reexport_library -Wl,$out/lib/libcharset.dylib
  '';
}