{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, perl, pythonPackages, libiconv }:

stdenv.mkDerivation {
  pname = "universal-ctags";
  version = "unstable-2019-07-30";

  src = fetchFromGitHub {
    owner = "universal-ctags";
    repo = "ctags";
    rev = "920e7910146915e5cae367bc9f135ffd8b042042";
    sha256 = "14n3ix77rkhq6vq6kspmgjrmm0kg0f8cxikyqdq281sbnfq8bajn";
  };

  nativeBuildInputs = [ autoreconfHook pkgconfig pythonPackages.docutils ];
  buildInputs = stdenv.lib.optional stdenv.isDarwin libiconv;

  # to generate makefile.in
  autoreconfPhase = ''
    ./autogen.sh
  '';

  configureFlags = [ "--enable-tmpdir=/tmp" ];

  postPatch = ''
    # Remove source of non-determinism
    substituteInPlace main/options.c \
      --replace "printf (\"  Compiled: %s, %s\n\", __DATE__, __TIME__);" ""
  '';

  postConfigure = ''
    sed -i 's|/usr/bin/env perl|${perl}/bin/perl|' misc/optlib2c
  '';

  doCheck = true;

  checkFlags = "units";

  meta = with stdenv.lib; {
    description = "A maintained ctags implementation";
    homepage = https://ctags.io/;
    license = licenses.gpl2Plus;
    platforms = platforms.unix;
    # universal-ctags is preferred over emacs's ctags
    priority = 1;
    maintainers = [ maintainers.mimame ];
  };
}