{
  stdenv,
  lib,
  stdenvNoCC,
  fetchzip,
  sourceData,
  versionData,
  buildFreebsd,
  patchesRoot,
  writeText,
}:

self:

lib.packagesFromDirectoryRecursive {
  callPackage = self.callPackage;
  directory = ./pkgs;
}
// {
  inherit sourceData patchesRoot versionData;
  patches = ./patches + "/${self.versionData.revision}";

  # Keep the crawled portion of Nixpkgs finite.
  buildFreebsd = lib.dontRecurseIntoAttrs buildFreebsd // {
    __attrsFailEvaluation = true;
  };

  ports = fetchzip {
    url = "https://cgit.freebsd.org/ports/snapshot/ports-dde3b2b456c3a4bdd217d0bf3684231cc3724a0a.tar.gz";
    sha256 = "BpHqJfnGOeTE7tkFJBx0Wk8ryalmf4KNTit/Coh026E=";
  };

  compatIsNeeded = !stdenvNoCC.hostPlatform.isFreeBSD;
  compatIfNeeded = lib.optional self.compatIsNeeded self.compat;
  freebsd-lib = import ./lib {
    version = lib.concatStringsSep "." (
      map toString (
        lib.filter (x: x != null) [
          self.versionData.major
          self.versionData.minor
          self.versionData.patch or null
        ]
      )
    );
    inherit lib writeText;
  };

  # The manual callPackages below should in principle be unnecessary, but are
  # necessary. See note in ../netbsd/default.nix

  compat = self.callPackage ./pkgs/compat/package.nix {
    inherit stdenv;
    inherit (buildFreebsd) makeMinimal;
  };

  csu = self.callPackage ./pkgs/csu.nix {
    inherit (buildFreebsd) makeMinimal install gencat;
    inherit (self) include;
  };

  include = self.callPackage ./pkgs/include/package.nix { inherit (buildFreebsd) rpcgen mtree; };

  install = self.callPackage ./pkgs/install.nix {
    inherit (buildFreebsd) makeMinimal;
    inherit (self) libmd libnetbsd;
  };

  libc = self.callPackage ./pkgs/libc/package.nix {
    inherit (buildFreebsd)
      makeMinimal
      install
      gencat
      rpcgen
      mkcsmapper
      mkesdb
      ;
    inherit (self) csu include;
  };

  libnetbsd = self.callPackage ./pkgs/libnetbsd/package.nix { inherit (buildFreebsd) makeMinimal; };

  libmd = self.callPackage ./pkgs/libmd.nix { inherit (buildFreebsd) makeMinimal; };

  mkDerivation = self.callPackage ./pkgs/mkDerivation.nix {
    inherit stdenv;
    inherit (buildFreebsd)
      freebsdSetupHook
      makeMinimal
      install
      tsort
      lorder
      ;
  };

  makeMinimal = self.callPackage ./pkgs/makeMinimal.nix { inherit (self) make; };

  mtree = self.callPackage ./pkgs/mtree.nix { inherit (self) libnetbsd libmd; };

  tsort = self.callPackage ./pkgs/tsort.nix { inherit (buildFreebsd) makeMinimal install; };
}