diff --git a/Makefile b/Makefile
index 10c26a0..ad23202 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,21 @@
 # SPDX-License-Identifier: MIT
 
 CC = gcc
-CFLAGS = -Wall -Wextra -Werror -Wno-unused-parameter 
-CFLAGS += -Wno-unused-variable -Wno-unused-function 
+CFLAGS = -Wall -Wextra -Werror -Wno-unused-parameter
+CFLAGS += -Wno-unused-variable -Wno-unused-function
 CFLAGS += -Wno-unused-but-set-variable -Wno-unused-value -Wno-unused-label
 CFLAGS += -Wno-unused-result -Wno-unused-const-variable
 
-ifneq ($(DEBUG), 1)
+CFLAGS += -I.
+
+ifneq ($(RELEASE), 1)
+CFLAGS += -g -O0 -std=c99 -march=native -mtune=native
+CFLAGS += -DDEBUG
+else
 CFLAGS += -fno-exceptions -fno-asynchronous-unwind-tables -fno-ident
 CFLAGS += -fno-unwind-tables -fno-stack-protector -fno-plt -fno-pic
 CFLAGS += -O3 -std=c99 -march=native -mtune=native -fomit-frame-pointer
 CFLAGS += -fshort-enums
-else
-CFLAGS += -g -O0 -std=c99 -march=native -mtune=native
-CFLAGS += -DDEBUG
 endif # DEBUG
 
 LDFLAGS = -lm
@@ -50,7 +52,7 @@ install:
 	@cp ringbuf.h /usr/local/include
 
 clean:
-	rm -f $(OBJECTS) $(ASMS) driver librbuf.a librbuf.so
+	rm -f $(OBJECTS) $(ASMS) driver librbuf.a librbuf.so **/*.o **/*.elf
 
 asm: $(ASMS) $(OBJECTS)
 	wc -l $(ASMS)