MacOS + R: Library not found for -liconv when evaluating R package derivation

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After recieving the suggestion to adjust sf’s buildInputs (here) I realised I could adjust the sf buildInputs using the otherOverrides overlay within the r-modules derivation (nixpkgs/pkgs/development/r-modules/default.nix):

otherOverrides = old: new: {
...

    sf = old.sf.overrideDerivation (attrs: with pkgs; {
      buildInputs = [ libtiff sqlite gdal proj geos ] ++ attrs.buildInputs;
    });
...
}

However, no effect was discernible.