makeFontsConf: add darwin system fonts (#228619)

{ runCommand, libxslt, fontconfig, dejavu_fonts, fontDirectories }:

{ runCommand, stdenv, lib, libxslt, fontconfig, dejavu_fonts, fontDirectories }:

runCommand "fonts.conf"

  {

    nativeBuildInputs = [ libxslt ];

    buildInputs = [ fontconfig ];

    # Add a default font for non-nixos systems, <1MB and in nixos defaults.

    fontDirectories = fontDirectories ++ [ dejavu_fonts.minimal ];

    fontDirectories = fontDirectories ++ [ dejavu_fonts.minimal ]

      # further non-nixos fonts on darwin

      ++ lib.optionals stdenv.isDarwin [ "/System/Library/Fonts" "/Library/Fonts" "~/Library/Fonts" ];

  }

  ''

    xsltproc --stringparam fontDirectories "$fontDirectories" \