Index: head/sys/amd64/conf/GENERIC
===================================================================
--- head/sys/amd64/conf/GENERIC
+++ head/sys/amd64/conf/GENERIC
@@ -63,6 +63,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/amd64/conf/MINIMAL
===================================================================
--- head/sys/amd64/conf/MINIMAL
+++ head/sys/amd64/conf/MINIMAL
@@ -60,6 +60,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/arm/conf/std.arm
===================================================================
--- head/sys/arm/conf/std.arm
+++ head/sys/arm/conf/std.arm
@@ -4,6 +4,7 @@
 
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 
 # Debugging support.  Always need this:
 makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols
Index: head/sys/arm/conf/std.armv6
===================================================================
--- head/sys/arm/conf/std.armv6
+++ head/sys/arm/conf/std.armv6
@@ -49,6 +49,7 @@
 
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 
 # DTrace support
 options 	KDTRACE_HOOKS		# Kernel DTrace hooks
Index: head/sys/arm/conf/std.armv7
===================================================================
--- head/sys/arm/conf/std.armv7
+++ head/sys/arm/conf/std.armv7
@@ -49,6 +49,7 @@
 
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 
 # DTrace support
 options 	KDTRACE_HOOKS		# Kernel DTrace hooks
Index: head/sys/arm64/conf/GENERIC
===================================================================
--- head/sys/arm64/conf/GENERIC
+++ head/sys/arm64/conf/GENERIC
@@ -54,6 +54,7 @@
 options 	GEOM_LABEL		# Provides labelization
 options 	COMPAT_FREEBSD32	# Compatible with FreeBSD/arm
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/conf/NOTES
===================================================================
--- head/sys/conf/NOTES
+++ head/sys/conf/NOTES
@@ -376,6 +376,9 @@
 # Enable FreeBSD11 compatibility syscalls
 options 	COMPAT_FREEBSD11
 
+# Enable FreeBSD12 compatibility syscalls
+options 	COMPAT_FREEBSD12
+
 # Enable Linux Kernel Programming Interface
 options 	COMPAT_LINUXKPI
 
Index: head/sys/conf/options
===================================================================
--- head/sys/conf/options
+++ head/sys/conf/options
@@ -88,6 +88,7 @@
 COMPAT_FREEBSD9	opt_global.h
 COMPAT_FREEBSD10	opt_global.h
 COMPAT_FREEBSD11	opt_global.h
+COMPAT_FREEBSD12	opt_global.h
 COMPAT_CLOUDABI32	opt_dontuse.h
 COMPAT_CLOUDABI64	opt_dontuse.h
 COMPAT_LINUXKPI	opt_dontuse.h
Index: head/sys/i386/conf/GENERIC
===================================================================
--- head/sys/i386/conf/GENERIC
+++ head/sys/i386/conf/GENERIC
@@ -60,6 +60,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/i386/conf/MINIMAL
===================================================================
--- head/sys/i386/conf/MINIMAL
+++ head/sys/i386/conf/MINIMAL
@@ -60,6 +60,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/mips/conf/ERL
===================================================================
--- head/sys/mips/conf/ERL
+++ head/sys/mips/conf/ERL
@@ -75,6 +75,7 @@
 options 	COMPAT_FREEBSD32	# Compatible with o32 binaries
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support
Index: head/sys/mips/conf/JZ4780
===================================================================
--- head/sys/mips/conf/JZ4780
+++ head/sys/mips/conf/JZ4780
@@ -31,6 +31,7 @@
 
 options 	COMPAT_FREEBSD10
 options 	COMPAT_FREEBSD11
+options 	COMPAT_FREEBSD12
 
 options 	SCHED_4BSD		#4BSD scheduler
 options 	INET			#InterNETworking
Index: head/sys/mips/conf/X1000
===================================================================
--- head/sys/mips/conf/X1000
+++ head/sys/mips/conf/X1000
@@ -29,6 +29,7 @@
 
 options 	COMPAT_FREEBSD10
 options 	COMPAT_FREEBSD11
+options 	COMPAT_FREEBSD12
 
 options 	SCHED_4BSD		#4BSD scheduler
 options 	INET			#InterNETworking
Index: head/sys/mips/conf/std.BERI
===================================================================
--- head/sys/mips/conf/std.BERI
+++ head/sys/mips/conf/std.BERI
@@ -33,6 +33,7 @@
 
 options 	COMPAT_FREEBSD10
 options 	COMPAT_FREEBSD11
+options 	COMPAT_FREEBSD12
 
 options 	INTRNG
 options 	SCHED_ULE
Index: head/sys/powerpc/conf/GENERIC
===================================================================
--- head/sys/powerpc/conf/GENERIC
+++ head/sys/powerpc/conf/GENERIC
@@ -68,6 +68,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		#Delay (in ms) before probing SCSI 
 options 	KTRACE			#ktrace(1) syscall trace support
 options 	STACK			#stack(9) support
Index: head/sys/powerpc/conf/GENERIC64
===================================================================
--- head/sys/powerpc/conf/GENERIC64
+++ head/sys/powerpc/conf/GENERIC64
@@ -72,6 +72,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		#Delay (in ms) before probing SCSI 
 options 	KTRACE			#ktrace(1) syscall trace support
 options 	STACK			#stack(9) support
Index: head/sys/powerpc/conf/MPC85XX
===================================================================
--- head/sys/powerpc/conf/MPC85XX
+++ head/sys/powerpc/conf/MPC85XX
@@ -61,6 +61,7 @@
 options 	WITNESS_SKIPSPIN
 options 	COMPAT_FREEBSD10
 options 	COMPAT_FREEBSD11
+options 	COMPAT_FREEBSD12
 options 	HWPMC_HOOKS
 options 	KDTRACE_HOOKS		# Kernel DTrace hooks
 options 	DDB_CTF			# Kernel ELF linker loads CTF data
Index: head/sys/powerpc/conf/MPC85XXSPE
===================================================================
--- head/sys/powerpc/conf/MPC85XXSPE
+++ head/sys/powerpc/conf/MPC85XXSPE
@@ -62,6 +62,7 @@
 options 	WITNESS_SKIPSPIN
 options 	COMPAT_FREEBSD10
 options 	COMPAT_FREEBSD11
+options 	COMPAT_FREEBSD12
 options 	HWPMC_HOOKS
 options 	KDTRACE_HOOKS		# Kernel DTrace hooks
 options 	DDB_CTF			# Kernel ELF linker loads CTF data
Index: head/sys/sparc64/conf/GENERIC
===================================================================
--- head/sys/sparc64/conf/GENERIC
+++ head/sys/sparc64/conf/GENERIC
@@ -58,6 +58,7 @@
 options 	COMPAT_FREEBSD9		# Compatible with FreeBSD9
 options 	COMPAT_FREEBSD10	# Compatible with FreeBSD10
 options 	COMPAT_FREEBSD11	# Compatible with FreeBSD11
+options 	COMPAT_FREEBSD12	# Compatible with FreeBSD12
 options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
 options 	KTRACE			# ktrace(1) support
 options 	STACK			# stack(9) support