diff --git a/tools/sky/Makefile b/tools/sky/Makefile
new file mode 100644
index 000000000..0b1fa08db
--- /dev/null
+++ b/tools/sky/Makefile
@@ -0,0 +1,25 @@
+ifndef HOST_OS
+  ifeq ($(OS),Windows_NT)
+    HOST_OS := Windows
+  else
+    HOST_OS := $(shell uname)
+  endif
+endif
+
+ifeq ($(HOST_OS),Windows)
+  SERIALDUMP = serialdump-windows
+endif
+
+ifeq ($(HOST_OS),Darwin)
+  SERIALDUMP = serialdump-macos
+endif
+
+ifndef SERIALDUMP
+  # Assume Linux
+  SERIALDUMP = serialdump-linux
+endif
+
+all:	$(SERIALDUMP)
+
+$(SERIALDUMP):	serialdump.c
+	$(CC) -o $@ $<