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{
  lib,
  stdenv,
  mkDerivation,
  versionData,
  bsdSetupHook,
  freebsdSetupHook,
  makeMinimal,
  boot-install,
  which,
  freebsd-lib,
  expat,
  zlib,
}:

let
  inherit (freebsd-lib) mkBsdArch;
in

mkDerivation {
  pname = "compat";
  path = "tools/build";
  extraPaths =
    [
      "lib/libc/db"
      "lib/libc/stdlib" # getopt
      "lib/libc/gen" # getcap
      "lib/libc/locale" # rpmatch
    ]
    ++ lib.optionals stdenv.hostPlatform.isLinux [
      "lib/libc/string" # strlcpy
      "lib/libutil"
    ]
    ++ [
      "contrib/libc-pwcache"
      "contrib/libc-vis"
      "sys/libkern"
      "sys/kern/subr_capability.c"

      # Take only individual headers, or else we will clobber native libc, etc.

      "sys/rpc/types.h"
    ]
    ++ lib.optionals (versionData.major == 14) [ "sys/sys/bitcount.h" ]
    ++ [

      # Listed in Makekfile as INC
      "include/mpool.h"
      "include/ndbm.h"
      "include/err.h"
      "include/stringlist.h"
      "include/a.out.h"
      "include/nlist.h"
      "include/db.h"
      "include/getopt.h"
      "include/nl_types.h"
      "include/elf.h"
      "sys/sys/ctf.h"
    ]
    ++ lib.optionals (versionData.major == 14) [
      "include/bitstring.h"
      "sys/sys/bitstring.h"
      "sys/sys/nv_namespace.h"
    ]
    ++ [

      # Listed in Makekfile as SYSINC

      "sys/sys/capsicum.h"
      "sys/sys/caprights.h"
      "sys/sys/imgact_aout.h"
      "sys/sys/nlist_aout.h"
      "sys/sys/nv.h"
      "sys/sys/dnv.h"
      "sys/sys/cnv.h"

      "sys/sys/elf32.h"
      "sys/sys/elf64.h"
      "sys/sys/elf_common.h"
      "sys/sys/elf_generic.h"
      "sys/${mkBsdArch stdenv}/include"
    ]
    ++ lib.optionals stdenv.hostPlatform.isx86 [ "sys/x86/include" ]
    ++ [

      "sys/sys/queue.h"
      "sys/sys/md5.h"
      "sys/sys/sbuf.h"
      "sys/sys/tree.h"
      "sys/sys/font.h"
      "sys/sys/consio.h"
      "sys/sys/fnv_hash.h"
      #"sys/sys/cdefs.h"
      #"sys/sys/param.h"
      "sys/sys/_null.h"
      #"sys/sys/types.h"
      "sys/sys/_pthreadtypes.h"
      "sys/sys/_stdint.h"

      "sys/crypto/chacha20/_chacha.h"
      "sys/crypto/chacha20/chacha.h"
      # included too, despite ".c"
      "sys/crypto/chacha20/chacha.c"

      "sys/fs"
      "sys/ufs"
      "sys/sys/disk"

      "lib/libcapsicum"
      "lib/libcasper"
      "lib/libmd"

      # idk bro
      "sys/sys/kbio.h"
    ];

  preBuild =
    ''
      NIX_CFLAGS_COMPILE+=' -I../../include -I../../sys'

      cp ../../sys/${mkBsdArch stdenv}/include/elf.h ../../sys/sys
      cp ../../sys/${mkBsdArch stdenv}/include/elf.h ../../sys/sys/${mkBsdArch stdenv}
    ''
    + lib.optionalString stdenv.hostPlatform.isx86 ''
      cp ../../sys/x86/include/elf.h ../../sys/x86
    '';

  setupHooks = [
    ../../../../../build-support/setup-hooks/role.bash
    ./compat-setup-hook.sh
  ];

  # This one has an ifdefed `#include_next` that makes it annoying.
  postInstall = ''
    rm ''${!outputDev}/0-include/libelf.h
  '';

  nativeBuildInputs = [
    bsdSetupHook
    freebsdSetupHook
    makeMinimal
    boot-install

    which
  ];
  buildInputs = [
    expat
    zlib
  ];

  makeFlags = [
    "STRIP=-s" # flag to install, not command
    "MK_WERROR=no"
    "HOST_INCLUDE_ROOT=${lib.getDev stdenv.cc.libc}/include"
    "INSTALL=boot-install"
  ];

  preIncludes =
    ''
      mkdir -p $out/{0,1}-include
      cp --no-preserve=mode -r cross-build/include/common/* $out/0-include
    ''
    + lib.optionalString stdenv.hostPlatform.isLinux ''
      cp --no-preserve=mode -r cross-build/include/linux/* $out/1-include
    ''
    + lib.optionalString stdenv.hostPlatform.isDarwin ''
      cp --no-preserve=mode -r cross-build/include/darwin/* $out/1-include
    '';

  # Compat is for making other platforms look like FreeBSD (e.g. to
  # build build-time dependencies for building FreeBSD packages). It is
  # not needed when building for FreeBSD.
  meta.broken = stdenv.hostPlatform.isFreeBSD;
}