diff --git a/Makefile b/Makefile
index eeac0f6..cdf66da 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,14 @@
+CFLAGS = -Wall -Wextra -Werror -Wl,-z,now -D_FORTIFY_SOURCE=2
+CFLAGS_RELEASE = ${CFLAGS} -O2 -s
+CFLAGS_DEBUG = ${CFLAGS} -O0 -g -fsanitize=leak,undefined
+LIBS = -lbsd -lcrypt
+CC = gcc
+
 all: rdo.c
-	gcc -D_FORTIFY_SOURCE=2 -O2 -s -Wl,-z,now -lcrypt -lbsd -Wall -Wextra -Werror rdo.c -o rdo
+	${CC} ${CFLAGS_RELEASE} rdo.c -o rdo ${LIBS}
 
 debug: rdo.c
-	gcc -O0 -g -Wl,-z,now -fsanitize=leak,address,undefined -lcrypt -lbsd -Wall -Wextra -Werror rdo.c -o rdo
+	${CC} ${CFLAGS_DEBUG} rdo.c -o rdo ${LIBS}
 
 install: rdo
 	cp rdo /usr/bin/rdo