--- Makefile.orig	2014-08-25 15:37:45 UTC
+++ Makefile
@@ -51,7 +51,7 @@ CFLAGS_COMMON ?= \
 	-pedantic \
 	-std=c99
 
-CFLAGS ?= $(CFLAGS_COMMON)
+CFLAGS += $(CFLAGS_COMMON)
 
 CC ?= cc $(CFLAGS)
 
@@ -66,10 +66,7 @@ debug: CFLAGS += $(WARN) \
 	-DDEBUG
 debug: $(EXECUTABLE)
 
-release: CFLAGS += \
-	-s \
-	-O2 \
-	-DNDEBUG
+release: CFLAGS += -DNDEBUG
 release: $(EXECUTABLE)
 
 $(EXECUTABLE): $(OBJECTS)