diff --git a/make/config.amd64.mk b/make/config.amd64.mk
index 9c9850c5..df31cd5d 100644
--- a/make/config.amd64.mk
+++ b/make/config.amd64.mk
@@ -7,5 +7,4 @@ include $(ONL)/make/config.mk
 export TOOLCHAIN := x86_64-linux-gnu
 export ARCH := amd64
 export UARCH := AMD64
-
-
+export __$(ARCH)__ := 1
diff --git a/make/config.arm64.mk b/make/config.arm64.mk
index fa294082..27587349 100644
--- a/make/config.arm64.mk
+++ b/make/config.arm64.mk
@@ -7,3 +7,4 @@ include $(ONL)/make/config.mk
 export TOOLCHAIN := aarch64-linux-gnu
 export ARCH := arm64
 export UARCH := ARM64
+export __$(ARCH)__ := 1
diff --git a/make/config.armel.mk b/make/config.armel.mk
index e4dca860..fe6b8c4c 100644
--- a/make/config.armel.mk
+++ b/make/config.armel.mk
@@ -7,3 +7,4 @@ include $(ONL)/make/config.mk
 export TOOLCHAIN := arm-linux-gnueabi
 export ARCH := armel
 export UARCH := ARMEL
+export __$(ARCH)__ := 1
diff --git a/make/config.powerpc.mk b/make/config.powerpc.mk
index 2f2aa89c..e8aba400 100644
--- a/make/config.powerpc.mk
+++ b/make/config.powerpc.mk
@@ -7,5 +7,4 @@ include $(ONL)/make/config.mk
 export TOOLCHAIN := powerpc-linux-gnu
 export ARCH := powerpc
 export UARCH := PPC
-
-
+export __$(ARCH)__ := 1