--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -179,7 +179,7 @@ ifeq ($(CONFIG_PPC32),y)
 include/asm: arch/$(ARCH)/include/asm
 arch/$(ARCH)/include/asm: FORCE
 	$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
-	$(Q)ln -fsn $(srctree)/include/asm-$(OLDARCH) arch/$(ARCH)/include/asm
+	$(Q)ln -fsn $(if $(KBUILD_SRC),$(KBUILD_SRC),../../..)/include/asm-$(OLDARCH) arch/$(ARCH)/include/asm
 endif
 
 # Use the file '.tmp_gas_check' for binutils tests, as gas won't output