anchor.diff:  , perl, pixman, vde2, alsa-lib, texinfo, flex
   , bison, lzo, snappy, libaio, libtasn1, gnutls, nettle, curl, ninja, meson, sigtool
   , makeWrapper, runtimeShell
  -, attr, libcap, libcap_ng
  +, attr, libcap, libcap_ng, socat
   , CoreServices, Cocoa, Hypervisor, rez, setfile
   , numaSupport ? stdenv.isLinux && !stdenv.isAarch32, numactl
   , seccompSupport ? stdenv.isLinux, libseccomp
  
positive.code:   '';
    preBuild = "cd build";
  
    # Add a ‘qemu-kvm’ wrapper for compatibility/convenience.
    postInstall = ''
      ln -s $out/bin/qemu-system-${stdenv.hostPlatform.qemuArch} $out/bin/qemu-kvm
  
negative.code: 
    passthru = {
      qemu-system-i386 = "bin/qemu-system-i386";
      tests = {
        qemu-tests = qemu.override { doCheck = true; };
      };
    };
  
    # Builds in ~3h with 2 cores, and ~20m with a big-parallel builder.
  