{
  nixpkgs.overlays = [(final: prev: {
    stdenv = let
      adapt = prev.stdenvAdapters;
      unhardened = adapt.withDefaultHardeningFlags [] prev.stdenv;
      #withflags = adapt.withCFlags [ "-misa-spec=2.2" ] unhardened;
    in unhardened;
  })];

  nixpkgs.buildPlatform.system = "x86_64-linux";

  nixpkgs.hostPlatform = {
    gcc.arch = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zfhmin_zkt_zba_zbb_zbc_zbs_zbkc_zvfh_zvfhmin_zvkt";
    gcc.abi = "lp64d";
    system = "riscv64-unknown-linux-gnu";
  };
}