--- a/third/blackwidow/Makefile
+++ b/third/blackwidow/Makefile
@@ -1,7 +1,5 @@
 CLEAN_FILES = # deliberately empty, so we can append below.
-CXX=g++
-LDFLAGS= -lpthread -lrt
-CXXFLAGS= -g -std=c++11 -fno-builtin-memcmp -msse -msse4.2 -pipe -fPIC
+CXXFLAGS+= -std=c++11 -fno-builtin-memcmp -pipe -fPIC -fno-rtti $(CPPFLAGS)
 PROFILING_FLAGS=-pg
 ARFLAGS = rs
 OPT=
@@ -18,7 +16,7 @@
 # don't treat warnings as errors
 ifeq ($(DEBUG_LEVEL),0)
 DISABLE_WARNING_AS_ERROR=1
-OPT += -O2 -fno-omit-frame-pointer -DNDEBUG
+OPT += -Oz -fno-omit-frame-pointer -DNDEBUG
 else
 $(warning Warning: Compiling in debug mode. Don't use the resulting binary in production)
 OPT += -O0 $(PROFILING_FLAGS)
@@ -91,7 +89,7 @@
   WARNING_FLAGS += -Werror
 endif
 
-CXXFLAGS += $(WARNING_FLAGS) -I. -I./include -I$(ROCKSDB_INCLUDE_DIR) -I$(ROCKSDB_PATH) -I$(SLASH_INCLUDE_DIR) $(OPT)
+CXXFLAGS += $(WARNING_FLAGS) -I. -I./include -I$(SLASH_INCLUDE_DIR) $(OPT)
 
 date := $(shell date +%F)
 git_sha := $(shell git rev-parse HEAD 2>/dev/null)