diff --git a/.gitignore b/.gitignore
index 3f0df94..2c0831e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 scratch/
 *.o
 cmsg
+depend.mk
diff --git a/Makefile b/Makefile
index 53012aa..58a5067 100644
--- a/Makefile
+++ b/Makefile
@@ -16,3 +16,9 @@ clean:
 	rm -f $(TARGET)
 	rm -f $(OBJECTS)
 	rm -rf *.dSYM
+	rm -f depend.mk
+
+depend.mk:
+	gcc $(CFLAGS) -M *.c > $@
+	echo "depend.mk:" Makefile *.c >> $@
+-include depend.mk