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{ stdenv, fetchurl, fetchpatch, bison, flex, pam
, sendmailPath ? "/run/wrappers/bin/sendmail"
, atWrapperPath ? "/run/wrappers/bin/at"
}:

stdenv.mkDerivation rec {
  name = "at-${version}";
  version = "3.1.20";

  src = fetchurl {
    # Debian is apparently the last location where it can be found.
    url = "mirror://debian/pool/main/a/at/at_${version}.orig.tar.gz";
    sha256 = "1fgsrqpx0r6qcjxmlsqnwilydhfxn976c870mjc0n1bkmcy94w88";
  };

  patches = [
    ./install.patch
    (fetchpatch {
      url = "https://raw.githubusercontent.com/riscv/riscv-poky/master/meta/recipes-extended/at/at/0001-remove-glibc-assumption.patch";
      sha256 = "1rk4hskp0c1jqkanzdxf873i6jgki3xhrm609fsam8an8sl1njnm";
    })
  ];

  nativeBuildInputs = [ bison flex ];

  buildInputs = [ pam ];

  preConfigure =
    ''
      export SENDMAIL=${sendmailPath}
      # Purity: force atd.pid to be placed in /var/run regardless of
      # whether it exists now.
      substituteInPlace ./configure --replace "test -d /var/run" "true"
    '';

  configureFlags =
    ''
       --with-etcdir=/etc/at
       --with-jobdir=/var/spool/atjobs --with-atspool=/var/spool/atspool
       --with-daemon_username=atd --with-daemon_groupname=atd
    '';

  # Ensure that "batch" can invoke the setuid "at" wrapper, if it exists, or
  # else we get permission errors (on NixOS). "batch" is a shell script, so
  # when the kernel executes it it drops setuid perms.
  postInstall = ''
    sed -i "6i test -x ${atWrapperPath} && exec ${atWrapperPath} -qb now  # exec doesn't return" "$out/bin/batch"
  '';

  meta = {
    description = ''The classical Unix `at' job scheduling command'';
    license = stdenv.lib.licenses.gpl2Plus;
    homepage = https://packages.qa.debian.org/at;
    platforms = stdenv.lib.platforms.linux;
  };
}