cask "gfortran" do
  if MacOS.version <= :el_capitan
    version "6.1"
    sha256 "eb817bce64bf9032595e09166bdaaf740c83bf7258f900b79cd6786437bacbf4"

    # github.com/fxcoudert/gfortran-for-macOS/ was verified as official when first introduced to the cask
    url "https://github.com/fxcoudert/gfortran-for-macOS/releases/download/#{version}/gfortran-#{version}-ElCapitan.dmg"
    pkg "gfortran-#{version}-ElCapitan/gfortran.pkg"
  elsif MacOS.version <= :high_sierra
    version "6.3"
    sha256 "38b81bc878dba41cfdbb0c335aec5a97554a5d1766fb3e3ca6be7da0df9e8e09"

    # github.com/fxcoudert/gfortran-for-macOS/ was verified as official when first introduced to the cask
    url "https://github.com/fxcoudert/gfortran-for-macOS/releases/download/#{version}/gfortran-#{version}-Sierra.dmg"
    pkg "gfortran-#{version}-Sierra/gfortran.pkg"
  else
    version "8.2"
    sha256 "81d379231ba5671a5ef1b7832531f53be5a1c651701a61d87e1d877c4f06d369"

    # github.com/fxcoudert/gfortran-for-macOS/ was verified as official when first introduced to the cask
    url "https://github.com/fxcoudert/gfortran-for-macOS/releases/download/#{version}/gfortran-#{version}-Mojave.dmg"
    pkg "gfortran-#{version}-Mojave/gfortran.pkg"
  end

  appcast "https://github.com/fxcoudert/gfortran-for-macOS/releases.atom"
  name "gfortran"
  homepage "https://gcc.gnu.org/wiki/GFortranBinaries"

  conflicts_with formula: "gcc"
  depends_on macos: ">= :el_capitan"

  uninstall delete:  [
    "/usr/local/gfortran",
    "/usr/local/bin/gfortran",
  ],
            pkgutil: "com.gnu.gfortran"

  caveats do
    files_in_usr_local
  end
end