You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: whois.rb
    path of file: ./repos/homebrew-core/Formula/w
    
    the code of the file until where you have to start completion: class Whois < Formula
  desc "Lookup tool for domain names and other int
    
  def install
    ENV.append "LDFLAGS", "-L/usr/lib -liconv" if OS.mac?

    # Fix compile with newer Clang
    ENV.append_to_cflags "-Wno-implicit-function-declaration" if DevelopmentTools.clang_build_version >= 1403

    have_iconv = if OS.mac?
      "HAVE_ICONV=1"
    else
      "HAVE_ICONV=0"
    end