> diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
> index bb1f1dbb34e8..61de992bbea3 100644
> --- a/arch/arm64/Makefile
> +++ b/arch/arm64/Makefile
> @@ -52,7 +52,7 @@ ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
>
> ifeq ($(CONFIG_CC_IS_CLANG), y)
> $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
> - else ifeq ($(CROSS_COMPILE_COMPAT),)
> + else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
> $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
> else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
> $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
> --
> 2.22.0