--- a/lua/Makefile
+++ b/lua/Makefile
@@ -13,7 +13,7 @@ osx_ge = $(shell if [ $(OS_VERSION) -ge $(1) ] ; then echo "$(2)"; else echo "$(
 
 CFLAGS += $(call osx_ge,10,"-mmacosx-version-min=10.10","")
 else
-CFLAGS = -O2 -Wall -Wextra -DLUA_USE_LINUX
+CFLAGS += -Wall -Wextra -DLUA_USE_LINUX
 endif
 
 OBJ_FILES = lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o \
--- a/lua/Makefile
+++ b/lua/Makefile
@@ -25,8 +25,8 @@ OBJ_FILES = lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o
 all: $(LUA_LIB)
 
 $(LUA_LIB): $(OBJ_FILES)
-	ar rcu $@ $(OBJ_FILES)
-	ranlib $@
+	$(AR) rcu $@ $(OBJ_FILES)
+	$(RANLIB) $@
 
 clean:
 	rm -f $(LUA_LIB) $(OBJ_FILES)