{ stdenv, execline, fetchgit, skalibs }:

let

  version = "2.6.1.1";

in stdenv.mkDerivation rec {

  name = "s6-${version}";

  src = fetchgit {
    url = "git://git.skarnet.org/s6";
    rev = "refs/tags/v${version}";
    sha256 = "162hng8xcwjp8pr4d78zq3f82lm9c6ldbcfll0mjsmnxdds5hrsg";
  };

  dontDisableStatic = true;

  enableParallelBuilding = true;

  configureFlags = [
    "--enable-absolute-paths"
    "--with-sysdeps=${skalibs}/lib/skalibs/sysdeps"
    "--with-include=${skalibs}/include"
    "--with-include=${execline}/include"
    "--with-lib=${skalibs}/lib"
    "--with-lib=${execline}/lib"
    "--with-dynlib=${skalibs}/lib"
    "--with-dynlib=${execline}/lib"
  ]
  ++ (if stdenv.isDarwin then [ "--disable-shared" ] else [ "--enable-shared" ])
  ++ (stdenv.lib.optional stdenv.isDarwin "--build=${stdenv.system}");

  meta = {
    homepage = http://www.skarnet.org/software/s6/;
    description = "skarnet.org's small & secure supervision software suite";
    platforms = stdenv.lib.platforms.all;
    license = stdenv.lib.licenses.isc;
    maintainers = with stdenv.lib.maintainers; [ pmahoney ];
  };

}