Re: buildkernel failed - subr_unit.c: unused variable

I commented out all wireless and ISA network cards and have another error:

$ make buildkernel KERNCONF=ANO
...
cc -c -O -pipe  -Wall -Wredundant-decls -Wnested-externs 
-Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline 
-Wcast-qual  -Wold-style-definition -Wold-style-declaration -Wno-inline 
  -Wno-pointer-sign -std=c99 -Wno-unused-but-set-variable -g -nostdinc 
-I. -Iinclude -I/usr/src/sys -I/usr/src/sys/../include 
-I/usr/obj/usr/src/sys/ANO -I"/usr/src/sys/dev/acpica" 
-I"/usr/src/sys/contrib/dev/acpica-unix/include" 
-I/usr/src/sys/dev/netif/ath/hal 
-I/usr/src/sys/dev/netif/ath/hal/ath_hal -I/usr/src/sys/dev/drm/include 
  -D_KERNEL -include opt_global.h  -finline-limit=8000 --param 
inline-unit-growth=100 --param large-function-growth=1000 -fno-common 
-ffreestanding -mpreferred-stack-boundary=4 -fno-stack-protector 
-mcmodel=kernel -mno-red-zone -mfpmath=387 -mno-mmx -mno-3dnow -mno-sse 
-mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -mno-sse4 
-mno-sse4a  -mno-sse5 -mno-abm -mno-aes -mno-avx -mno-pclmul -mno-popcnt 
-mno-avx2 -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-fma -mno-fma4 -mno-bmi 
-mno-bmi2 -mno-xop -mno-lwp -mno-lzcnt -mno-tbm -msoft-float 
-fno-asynchronous-unwind-tables -fno-omit-frame-pointer 
/usr/src/sys/kern/subr_unit.c -Werror
/usr/src/sys/kern/subr_unit.c: In function 'alloc_unrl':
/usr/src/sys/kern/subr_unit.c:492:17: error: unused variable 'td' 
[-Werror=unused-variable]
/usr/src/sys/kern/subr_unit.c:491:15: error: unused variable 'ml' 
[-Werror=unused-variable]
cc1: all warnings being treated as errors
*** Error code 1

Stop.
make: stopped in /usr/obj/usr/src/sys/ANO
*** Error code 1

Stop.
make: stopped in /usr/src
.CURDIR='/usr/src'
.OBJDIR='/usr/obj/usr/src'
LD_LIBRARY_PATH=''
MACHINE_ARCH='x86_64'
MACHINE='x86_64'
MAKEFILE='/usr/src/Makefile.inc1'
.TARGETS='buildkernel'
.ERROR_TARGET='buildkernel'
.MAKE.LEVEL='1'
*** Error code 1

Stop.
make: stopped in /usr/src

$ diff -u sys/config/X86_64_GENERIC sys/config/ANO
--- sys/config/X86_64_GENERIC   2013-11-06 08:31:18.000000000 +0000
+++ sys/config/ANO      2013-11-08 15:38:56.000000000 +0000
@@ -8,7 +8,7 @@
  machine                x86_64
  machine_arch   x86_64
  cpu            HAMMER_CPU
-ident          X86_64_GENERIC
+ident          ANO
  maxusers       0
  #options       CPU_DISABLE_AVX

@@ -63,7 +63,7 @@
  # Debugging for Development
  options        DDB
  options        DDB_TRACE
-options        INVARIANTS
+#options       INVARIANTS

  device         isa
  device         pci
@@ -249,19 +249,19 @@

  # ISA Ethernet NICs.
  # 'device ed' requires 'device miibus'
-device         ed0     at isa? disable port 0x280 irq 10 iomem 0xd8000
-device         ex
+#device                ed0     at isa? disable port 0x280 irq 10 iomem 
0xd8000
+#device                ex
  # Xircom Ethernet
-device         xe
+#device                xe

  # Wireless NIC cards
-options        IEEE80211_DEBUG         #enable debugging msgs
-options        IEEE80211_SUPPORT_MESH  #enable 802.11s D3.0 support
-options        IEEE80211_SUPPORT_TDMA  #enable TDMA support
-device         wlan            # 802.11 support
-device         wlan_ccmp       # 802.11 CCMP support
-device         wlan_tkip       # 802.11 TKIP support
-device         wlan_wep        # 802.11 WEP support
+#options       IEEE80211_DEBUG         #enable debugging msgs
+#options       IEEE80211_SUPPORT_MESH  #enable 802.11s D3.0 support
+#options       IEEE80211_SUPPORT_TDMA  #enable TDMA support
+#device                wlan            # 802.11 support
+#device                wlan_ccmp       # 802.11 CCMP support
+#device                wlan_tkip       # 802.11 TKIP support
+#device                wlan_wep        # 802.11 WEP support
  #device                wlan_amrr       # AMRR

  # Aironet 4500/4800 802.11 wireless NICs.  Note: the declaration below 
will
@@ -269,22 +269,22 @@
  # mode (the factory default). If you set the switches on your ISA
  # card for a manually chosen I/O address and IRQ, you must specify
  # those parameters here.
-device         an
-device         ath             # Atheros NICs
-device         ath_hal         # Atheros Hardware Access Layer
-options        AH_SUPPORT_AR5416       # enable AR5416 tx/rx descriptors
-device         ath_rate_sample # Atheros Sample TX rate control algorithm
-device         ral             # Ralink Technology 802.11 wireless NIC
-device         iwn             # Intel
+#device                an
+#device                ath             # Atheros NICs
+#device                ath_hal         # Atheros Hardware Access Layer
+#options       AH_SUPPORT_AR5416       # enable AR5416 tx/rx descriptors
+#device                ath_rate_sample # Atheros Sample TX rate control 
algorithm
+#device                ral             # Ralink Technology 802.11 
wireless NIC
+#device                iwn             # Intel
  #device                rtw             # RealTek 802.11 wireless NIC
  # WaveLAN/IEEE 802.11 wireless NICs.  Note: the WaveLAN/IEEE really
  # exists only as a PCMCIA device, so there is no ISA attachment needed
  # and resources will always be dynamically assigned by the pccard code.
-device         wi
+#device                wi

-device         lnc0    at isa? disable port 0x280 irq 10 drq 0
-device         cs0     at isa? disable port 0x300
-device         sn0     at isa? disable port 0x300 irq 10
+#device                lnc0    at isa? disable port 0x280 irq 10 drq 0
+#device                cs0     at isa? disable port 0x300
+#device                sn0     at isa? disable port 0x300 irq 10

  # Pseudo devices - the number indicates how many units to allocate.
  pseudo-device  loop            # Network loopback