diff --git a/Makefile b/Makefile
index 70847c41..23b0b45f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,8 @@
+GOOS   ?= linux
+GOARCH ?= arm
+GOARM  ?= 6
+
 all:
-	GOOS=linux GOARCH=arm GOARM=6 go build gen_gdl90.go traffic.go ry835ai.go network.go
+	GOOS=$(GOOS) GOARCH=$(GOARCH) GOARM=$(GOARM) go build gen_gdl90.go traffic.go ry835ai.go network.go
 clean:
 	rm -f gen_gdl90