anchor.diff:  
     # Enable the kernel's built-in memory tester.
     MEMTEST y
  -
  -  # Include the CFQ I/O scheduler in the kernel, rather than as a
  -  # module, so that the initrd gets a good I/O scheduler.
  -  IOSCHED_CFQ y
  -  BLK_CGROUP y # required by CFQ
   
     # Enable NUMA.
     NUMA y
  
positive.code:   # Linux containers.
    NAMESPACES y #  Required by 'unshare' used by 'nixos-install'
    RT_GROUP_SCHED y
    CGROUP_DEVICE y
    ${optionalString (versionAtLeast version "4.10") ''
      CGROUP_BPF y
  
negative.code:   # Random Devices
    SYNC_FILE y
    INTEL_PMC_CORE y
    ${optionalString (versionOlder version "5.0") ''
      INTEL_RDT${optionalString (versionOlder version "4.14") "_A"} y
    ''}
    ${optionalString (versionAtLeast version "5.0") ''
      X86_RESCTRL y
    ''}
    SSB_PCMCIAHOST y
    SSB_SDIOHOST y
  