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{ stdenv, fetchurl, pkgconfig, libpipeline, db, groff, makeWrapper }:

stdenv.mkDerivation rec {
  name = "man-db-2.7.5";

  src = fetchurl {
    url = "mirror://savannah/man-db/${name}.tar.xz";
    sha256 = "056a3il7agfazac12yggcg4gf412yq34k065im0cpfxbcw6xskaw";
  };

  outputs = [ "out" "doc" ];
  outputMan = "out"; # users will want `man man` to work

  nativeBuildInputs = [ pkgconfig makeWrapper ];
  buildInputs = [ libpipeline db groff ];

  postPatch = ''
    substituteInPlace src/man_db.conf.in \
      --replace "/usr/local/share" "/run/current-system/sw/share" \
      --replace "/usr/share" "/run/current-system/sw/share"
  '';

  configureFlags = [
    "--disable-setuid"
    "--localstatedir=/var"
    # Don't try /etc/man_db.conf by default, so we avoid error messages.
    "--with-config-file=\${out}/etc/man_db.conf"
    "--with-systemdtmpfilesdir=\${out}/lib/tmpfiles.d"
  ];

  postInstall = ''
    # apropos/whatis uses program name to decide whether to act like apropos or whatis
    # (multi-call binary). `apropos` is actually just a symlink to whatis. So we need to
    # make sure that we don't wrap symlinks (since that changes argv[0] to the -wrapped name)
    find "$out/bin" -type f | while read file; do
      wrapProgram "$file" --prefix PATH : "${groff}/bin"
    done
  '';

  enableParallelBuilding = true;

  doCheck = true;

  meta = with stdenv.lib; {
    homepage = http://man-db.nongnu.org;
    description = "An implementation of the standard Unix documentation system accessed using the man command";
    license = licenses.gpl2;
    platforms = platforms.linux;
  };
}