diff --git a/Makefile b/Makefile
index 0583ea9..a2181a7 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@
 # Simplified version from: https://github.com/hexagon5un/AVR-Programming
 
 MAIN = libsdc.c
+SRC = 
 
 CC = avr-gcc
 AR = avr-ar
@@ -19,6 +20,8 @@
 
 ARFLAGS = rcs
 
+MAKEFLAGS += -r
+
 TARGET = $(strip $(basename $(MAIN)))
 SRC += $(TARGET).c