anchor.diff:  
     postUnpack = ''
       sed -i -e "s@getopt@$(type -p getopt)@g" -e "s@sed@$(type -p sed)@g" ${pname}-${version}/scripts/fakeroot.in
  -  '';
  -
  -  postConfigure = let
  -    # additional patch from brew, but needs to be applied to a generated file
  -    patch-wraptmpf = fetchpatch {
  -      name = "fakeroot-patch-wraptmpf-h.patch";
  -      url = "https://bugs.debian.org/cgi-bin/bugreport.cgi?att=3;bug=766649;filename=fakeroot-patch-wraptmpf-h.patch;msg=20";
  -      sha256 = "1jhsi4bv6nnnjb4vmmmbhndqg719ckg860hgw98bli8m05zwbx6a";
  -    };
  -  in lib.optional stdenv.isDarwin ''
  -    make wraptmpf.h
  -    patch -p1 < ${patch-wraptmpf}
     '';
   
     passthru = {
  
positive.code: { lib, stdenv, fetchurl, fetchpatch, getopt, libcap, gnused, nixosTests }:
  
  stdenv.mkDerivation rec {
    version = "1.23";
    pname = "fakeroot";
  
    src = fetchurl {
      url = "http://http.debian.net/debian/pool/main/f/fakeroot/fakeroot_${version}.orig.tar.xz";
      sha256 = "1xpl0s2yjyjwlf832b6kbkaa5921liybaar13k7n45ckd9lxd700";
    };
  
    patches = lib.optionals stdenv.isLinux [
      ./einval.patch
  
      # glibc 2.33 patches from ArchLinux
      (fetchpatch {
        url = "https://raw.githubusercontent.com/archlinux/svntogit-packages/15b01cf37ff64c487f7440df4e09b090cd93b58f/fakeroot/trunk/fakeroot-1.25.3-glibc-2.33-fix-1.patch";
        sha256 = "sha256-F6BcxYInSLu7Fxg6OmMZDhTWoLqsc//yYPlTZqQQl68=";
      })
      (fetchpatch {
        url = "https://raw.githubusercontent.com/archlinux/svntogit-packages/15b01cf37ff64c487f7440df4e09b090cd93b58f/fakeroot/trunk/fakeroot-1.25.3-glibc-2.33-fix-2.patch";
        sha256 = "sha256-ifpJxhk6MyQpFolC1hIAAUjcHmOHVU1D25tRwpu2S/k=";
      })
      (fetchpatch {
        url = "https://raw.githubusercontent.com/archlinux/svntogit-packages/15b01cf37ff64c487f7440df4e09b090cd93b58f/fakeroot/trunk/fakeroot-1.25.3-glibc-2.33-fix-3.patch";
        sha256 = "sha256-o2Xm4C64Ny9TL8fjsZltjO1CdJ4VGwqZ+LnufVL5Sq8=";
      })
    ]
    # patchset from brew
    ++ lib.optionals stdenv.isDarwin [
      (fetchpatch {
        name = "0001-Implement-openat-2-wrapper-which-handles-optional-ar.patch";
        url = "https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=0001-Implement-openat-2-wrapper-which-handles-optional-ar.patch;att=1;bug=766649";
        sha256 = "1m6ggrqwqy0in264sxqk912vniipiw629dxq7kibakvsswfk6bkk";
      })
      (fetchpatch {
        name = "0002-OS-X-10.10-introduced-id_t-int-in-gs-etpriority.patch";
        url = "https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=0002-OS-X-10.10-introduced-id_t-int-in-gs-etpriority.patch;att=2;bug=766649";
        sha256 = "0rhayp42x4i1a6yc4d28kpshmf7lrmaprq64zfrjpdn4kbs0rkln";
      })
      (fetchpatch {
        name = "fakeroot-always-pass-mode.patch";
        url = "https://bugs.debian.org/cgi-bin/bugreport.cgi?att=2;bug=766649;filename=fakeroot-always-pass-mode.patch;msg=20";
        sha256 = "0i3zaca1v449dm9m1cq6wq4dy6hc2y04l05m9gg8d4y4swld637p";
      })
    ];
  
  
negative.code:     maintainers = with lib.maintainers; [viric];
      platforms = lib.platforms.unix;
    };
  }
  