diff --git a/Makefile b/Makefile
index 756a3a1..c820b86 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,14 @@
+sources := test.c uprintf.c idiv.c
+cflags  := -std=c89 -Os -Wl,--no-warn-execstack
+
+ifeq ($(CUSTOM_DIV_FUNC), 1)
+  cflags += -DUPRINTF_CUSTOM_DIV_FUNC
+endif
+
 all: test
 
 test: test.c uprintf.c uprintf.h
-	gcc -std=c89 -Os -DUPRINTF_CUSTOM_DIV_FUNC -o test test.c uprintf.c idiv.c
+	gcc $(cflags) -o test $(sources)
 
 clean:
 	rm -rf test