Makefile improvements, clean target
diff --git a/Makefile b/Makefile
index 54d9964..a55897f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,9 @@
 CPPFLAGS=$(shell pkg-config --cflags libsystemd)
 LDFLAGS=$(shell pkg-config --libs libsystemd)
 
-all: btbridged
+EXE = btbridged
+
+all: $(EXE)
+
+clean:
+	rm -rf *.o $(EXE)