diff --git a/Makefile b/Makefile
index f83b220..ffe20fa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
-CC	:= gcc
-CFLAGS	:= -O2 -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -g2
-LDFLAGS := -lrt
+CC	?= gcc
+CFLAGS	+= -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter
+LIBS := -lrt
 
 all: flashbench erase
 
@@ -9,7 +9,7 @@ vm.o: vm.c vm.h dev.h
 flashbench.o: flashbench.c vm.h dev.h
 
 flashbench: flashbench.o dev.o vm.o
-	$(CC) -o $@ flashbench.o dev.o vm.o $(LDFLAGS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ flashbench.o dev.o vm.o $(LIBS)
 
 
 erase: erase.o