diff --git a/makefile b/makefile
index fb1bed4..a0c0084 100644
--- a/makefile
+++ b/makefile
@@ -1,11 +1,11 @@
-CFLAGS = -Wall -std=c99
-LFLAGS = -lm
+CFLAGS ?= -Wall -std=c99
+LFLAGS ?= -lm
 CC = gcc
 
 all: overlay
 
 overlay: main.o logic.o sh.o
-	$(CC) $(LFLAGS) main.o logic.o sh.o -o overlay
+	$(CC) $(LFLAGS) $(LDFLAGS) main.o logic.o sh.o -o overlay
 
 main.o: main.c logic.h
 	$(CC) $(CFLAGS) -c main.c