{ ... }:

final: prev:
let
  python313ForCeph =
    let
      base = final.python313;
    in
    base
    // {
      override = args:
        base.override (args // {
          packageOverrides = self: super:
            (if args ? packageOverrides then args.packageOverrides self super else { })
            // {
              # Ceph still references cython_0 in nixpkgs; map it to modern cython on py3.13.
              cython_0 = super.cython;
            };
        });
    };
in {
  # Work around nixos-unstable eval failure:
  # sphinx-9.1.0 not supported for interpreter python3.11
  # (seen through libvirtd -> qemu_full -> ceph Python dependency chain).
  ceph = prev.ceph.override {
    python311 = python313ForCeph;
  };
}