anchor.diff:    ''}
   
     # Enable the 9P cache to speed up NixOS VM tests.
  -  9P_FSCACHE y
  -  9P_FS_POSIX_ACL y
  +  9P_FSCACHE? y
  +  9P_FS_POSIX_ACL? y
   
     ${kernelPlatform.kernelExtraConfig or ""}
     ${extraConfig}
  
positive.code:   ${optionalString (versionAtLeast version "3.3" && versionOlder version "3.13") ''
      AUDIT_LOGINUID_IMMUTABLE y
    ''}
    B43_PCMCIA y
    BLK_DEV_CMD640_ENHANCED y # CMD640 enhanced support
    BLK_DEV_IDEACPI y # IDE ACPI support
    BLK_DEV_INTEGRITY y
    BSD_PROCESS_ACCT_V3 y
    BT_HCIUART_BCSP y
    BT_HCIUART_H4 y # UART (H4) protocol support
    BT_HCIUART_LL y
    BT_RFCOMM_TTY? y # RFCOMM TTY support
    CRASH_DUMP? n
    ${optionalString (versionOlder version "3.1") ''
  
negative.code:   CLS_U32_MARK y
  
    # Wireless networking.
    CFG80211_WEXT? y # Without it, ipw2200 drivers don't build
    IPW2100_MONITOR? y # support promiscuous mode
    IPW2200_MONITOR? y # support promiscuous mode
    HOSTAP_FIRMWARE? y # Support downloading firmware images with Host AP driver
    HOSTAP_FIRMWARE_NVRAM? y
    ATH9K_PCI? y # Detect Atheros AR9xxx cards on PCI(e) bus
    ATH9K_AHB? y # Ditto, AHB bus
    ${optionalString (versionAtLeast version "3.2") ''
      B43_PHY_HT? y
    ''}
    BCMA_HOST_PCI? y
  
    # Enable various FB devices.
    FB y
  