ifeq ($(wildcard $(src)/compat/compat.h),)
ccflags-y += -include $(srctree)/$(src)/compat/compat.h
else
ccflags-y += -include $(src)/compat/compat.h
endif

ifeq ($(wildcard $(srctree)/include/linux/siphash.h),)
ccflags-y += -I$(src)/compat/siphash/include
wireguard-y += compat/siphash/siphash.o
endif

ifeq ($(wildcard $(srctree)/include/net/dst_cache.h),)
ccflags-y += -I$(src)/compat/dst_cache/include
wireguard-y += compat/dst_cache/dst_cache.o
endif

ifeq ($(wildcard $(srctree)/arch/x86/include/asm/fpu/api.h),)
ccflags-y += -I$(src)/compat/fpu/include
endif

ifeq ($(wildcard $(srctree)/arch/x86/include/asm/simd.h),)
ccflags-y += -I$(src)/compat/simd/include
endif

ifeq ($(wildcard $(srctree)/include/net/udp_tunnel.h),)
ccflags-y += -I$(src)/compat/udp_tunnel/include
wireguard-y += compat/udp_tunnel/udp_tunnel.o
endif

ifeq ($(shell grep -F "int crypto_memneq" "$(srctree)/include/crypto/algapi.h"),)
ccflags-y += -include $(src)/compat/memneq/include.h
wireguard-y += compat/memneq/memneq.o
endif