anchor.diff:    # mystery, though. :-(
     enableParallelBuilding = (!stdenv.isi686);
   
  -  installFlags = [ "DESTDIR=$(out)" ];
  +  installFlags = [ "DESTDIR=${placeholder "out"}" ];
   
     meta = with stdenv.lib; {
       description = "Stress test a computer system";
       longDescription = ''
  -      Stress test a system in various selectable ways, exercising both various
  -      physical subsystems and various operating system kernel interfaces:
  -      - over 130 different stress tests
  -      - over 70 CPU specific stress tests that exercise floating point,
  -        integer, bit manipulation and control flow
  -      - over 20 virtual memory stress tests
  -      stress-ng was originally intended to make a machine work hard and trip
  -      hardware issues such as thermal overruns as well as operating system
  -      bugs that only occur when a system is being thrashed hard.
  +      stress-ng will stress test a computer system in various selectable ways. It
  +      was designed to exercise various physical subsystems of a computer as well as
  +      the various operating system kernel interfaces. Stress-ng features:
  +
  +        * over 210 stress tests
  +        * over 50 CPU specific stress tests that exercise floating point, integer,
  +          bit manipulation and control flow
  +        * over 20 virtual memory stress tests
  +        * portable: builds on Linux, Solaris, *BSD, Minix, Android, MacOS X,
  +          Debian Hurd, Haiku, Windows Subsystem for Linux and SunOs/Dilos with
  +          gcc, clang, tcc and pcc.
  +
  +      stress-ng was originally intended to make a machine work hard and trip hardware
  +      issues such as thermal overruns as well as operating system bugs that only
  +      occur when a system is being thrashed hard. Use stress-ng with caution as some
  +      of the tests can make a system run hot on poorly designed hardware and also can
  +      cause excessive system thrashing which may be difficult to stop.
  +
  +      stress-ng can also measure test throughput rates; this can be useful to observe
  +      performance changes across different operating system releases or types of
  +      hardware. However, it has never been intended to be used as a precise benchmark
  +      test suite, so do NOT use it in this manner.
       '';
  -    homepage = https://kernel.ubuntu.com/~cking/stress-ng/;
  -    downloadPage = https://kernel.ubuntu.com/~cking/tarballs/stress-ng/;
  +    homepage = "https://kernel.ubuntu.com/~cking/stress-ng/";
  +    downloadPage = "https://kernel.ubuntu.com/~cking/tarballs/stress-ng/";
  +    changelog = "https://kernel.ubuntu.com/git/cking/stress-ng.git/plain/debian/changelog?h=V${version}";
       license = licenses.gpl2Plus;
       maintainers = with maintainers; [ c0bw3b ];
  -    platforms = platforms.linux; # TODO: fix https://github.com/NixOS/nixpkgs/pull/50506#issuecomment-439635963
  +    platforms = platforms.unix;
     };
   }
  
positive.code: }:
  
  stdenv.mkDerivation rec {
    name = "stress-ng-${version}";
    version = "0.09.57";
  
    src = fetchurl {
      url = "https://kernel.ubuntu.com/~cking/tarballs/stress-ng/${name}.tar.xz";
      sha256 = "0xp55m1kif8hcjdcdhgaarghqf1gz5fa24qwl6zpmxkzl6bn002x";
    };
  
    # All platforms inputs then Linux-only ones
  
negative.code:       attr keyutils libaio libapparmor libcap lksctp-tools
      ];
  
    postPatch = ''
      substituteInPlace Makefile --replace "/usr" ""
    '';
  
  