diff --git a/lib/alterl/Makefile b/lib/alterl/Makefile
new file mode 100644
index 0000000..0f2c8a8
--- /dev/null
+++ b/lib/alterl/Makefile
@@ -0,0 +1,7 @@
+MODULES = \
+	src
+
+all clean docs:
+	for dir in $(MODULES); do \
+		(cd $$dir; ${MAKE} $@); \
+	done