--- a/Makefile
+++ b/Makefile
@@ -72,8 +72,8 @@
 
 ifeq ($(PLATFORM),native)
 ifeq ($(CFG),release)
-	CXX_FLAGS := -D_POSIX_SOURCE -Os -std=c++17 -MMD -Wall -Wextra $(WERR_) -Wold-style-cast -Wnon-virtual-dtor -fno-exceptions -fno-rtti
-	LXXFLAGS := -lm -s -flto
+	CXX_FLAGS := $(CXXFLAGS) $(CPPFLAGS) -D_POSIX_SOURCE -std=c++17 -MMD -Wall -Wextra $(WERR_) -Wold-style-cast -Wnon-virtual-dtor -fno-exceptions -fno-rtti
+	LXXFLAGS := $(LDFLAGS) -lm -s -flto
 else ifeq ($(CFG),debug)
 	CXX_FLAGS := -D_POSIX_SOURCE -DWIZ_DEBUG -g -std=c++17 -MMD -Wall -Wextra $(WERR_) -Wold-style-cast -Wnon-virtual-dtor -fno-exceptions -fno-rtti
 	LXXFLAGS := -lm