offer alternative to arch
diff --git a/makefile_include.mk b/makefile_include.mk
index 5ebcd5d..2cc33fa 100644
--- a/makefile_include.mk
+++ b/makefile_include.mk
@@ -92,7 +92,7 @@ endif
ifeq ($(PLATFORM),FreeBSD)
_ARCH := $(shell sysctl -b hw.machine_arch)
else
- _ARCH := $(shell arch)
+ _ARCH := $(shell sh -c "if command -v arch 1> /dev/null;then arch;else uname -m;fi")
endif
# adjust coverage set