diff --git a/experiments/extensions/Makefile b/experiments/extensions/Makefile
new file mode 100644
index 0000000..67a06c9
--- /dev/null
+++ b/experiments/extensions/Makefile
@@ -0,0 +1,22 @@
+default: test
+
+build:
+	protoc -I . --python_out=. ext1.proto
+	protoc -I . --python_out=. ext2.proto
+
+test: build
+	./write_generic.py | ./read_generic.py
+	./write_generic.py | ./read_ext1.py
+	./write_generic.py | ./read_ext2.py
+	./write_generic.py | ./read_both.py
+
+	./write_ext1.py | ./read_generic.py
+	./write_ext1.py | ./read_ext1.py
+	./write_ext1.py | ./read_ext2.py
+	./write_ext1.py | ./read_both.py
+
+	./write_ext2.py | ./read_generic.py
+	./write_ext2.py | ./read_ext1.py
+	./write_ext2.py | ./read_ext2.py
+	./write_ext2.py | ./read_both.py
+