{ afdko }:
afdko.overridePythonAttrs (old: {
  # FMA changes overlap-removal coordinates by 0.01 units on x86-64-v3.
  # Separate multiply/add rounding reproduces the reference Type 1 font exactly.
  env = (old.env or { }) // {
    NIX_CFLAGS_COMPILE = (old.env.NIX_CFLAGS_COMPILE or "") + " -ffp-contract=off";
  };

  patches = (old.patches or [ ]) ++ [ ./check-overlap-font-content.patch ];
})