{ preparePort, nixpkgs, toolchain, upstream }:

let
  inherit (nixpkgs.buildPackages) fetchurl ;
in
preparePort {
  name = "libc-freebsd-12.0.0";
  outputs = [ "source" "dev" ];

  builder = ./libc-builder.sh;

  depsBuildBuild = with nixpkgs.buildPackages;
    [  flex bison glibc stdenv.cc toolchain ];

  src = fetchurl
    { url = "http://ftp.freebsd.org/pub/FreeBSD/releases/amd64/12.0-RELEASE/src.txz";
      sha256 = "0da393ac2174168a71c1c527d1453e07372295187d05c288250800cb152a889b";
    };

  tarFlags = [
    "--strip-components=2"
    "usr/src/contrib/gdtoa"
    "usr/src/contrib/libc-vis"
    "usr/src/contrib/tzcode/stdtime"
    "usr/src/include"
    "usr/src/lib/libc"
    "usr/src/lib/msun"
    "usr/src/sys/amd64"
    "usr/src/sys/arm"
    "usr/src/sys/arm64"
    "usr/src/sys/bsm"
    "usr/src/sys/crypto/chacha20"
    "usr/src/sys/i386"
    "usr/src/sys/libkern"
    "usr/src/sys/net"
    "usr/src/sys/netinet"
    "usr/src/sys/netinet6"
    "usr/src/sys/riscv"
    "usr/src/sys/rpc"
    "usr/src/sys/sys"
    "usr/src/sys/vm"
    "usr/src/sys/x86"
    ];

  sourceRoot = ".";

  patches = "${upstream.src}/repos/libports/src/lib/libc/patches/*.patch";
  patchFlags = "-p0 --strip 3";

  libcPcIn = ./libc.pc.in;
  libcSymbols = ./libc.symbols;
}