diff --git a/src/leveldb/Makefile b/src/leveldb/Makefile
index 7f658cfdf..14e494f3c 100755
--- a/src/leveldb/Makefile
+++ b/src/leveldb/Makefile
@@ -19,10 +19,10 @@ $(shell ./build_detect_platform build_config.mk)
 # this file is generated by the previous line to set build flags and sources
 include build_config.mk
 
-CFLAGS += -I. -I./include $(PLATFORM_CCFLAGS) $(OPT)
-CXXFLAGS += -I. -I./include $(PLATFORM_CXXFLAGS) $(OPT)
+xCFLAGS = -I. -I./include $(PLATFORM_CCFLAGS) $(OPT) $(CFLAGS)
+xCXXFLAGS = -I. -I./include $(PLATFORM_CXXFLAGS) $(OPT) $(CXXFLAGS)
 
-LDFLAGS += $(PLATFORM_LDFLAGS)
+xLDFLAGS = $(PLATFORM_LDFLAGS) $(LDFLAGS)
 
 LIBOBJECTS = $(SOURCES:.cc=.o)
 MEMENVOBJECTS = $(MEMENV_SOURCES:.cc=.o)
@@ -82,7 +82,7 @@ $(SHARED2): $(SHARED3)
 endif
 
 $(SHARED3):
-	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) $(PLATFORM_EXTRALIBS) -o $(SHARED3)
+	$(CXX) $(xLDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(xCXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) $(PLATFORM_EXTRALIBS) -o $(SHARED3)
 
 endif  # PLATFORM_SHARED_EXT
 
@@ -100,74 +100,74 @@ $(LIBRARY): $(LIBOBJECTS)
 	$(AR) -rs $@ $(LIBOBJECTS)
 
 db_bench: db/db_bench.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@  $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@  $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 db_bench_sqlite3: doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS) -lsqlite3
+	$(CXX) doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS) -lsqlite3
 
 db_bench_tree_db: doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS) -lkyotocabinet
+	$(CXX) doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS) -lkyotocabinet
 
 arena_test: util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 bloom_test: util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 c_test: db/c_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 cache_test: util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 coding_test: util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 corruption_test: db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 crc32c_test: util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 db_test: db/db_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/db_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/db_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 dbformat_test: db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 env_test: util/env_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/env_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) util/env_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 filename_test: db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 filter_block_test: table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 log_test: db/log_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/log_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/log_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 table_test: table/table_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) table/table_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) table/table_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 skiplist_test: db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 version_edit_test: db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 version_set_test: db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 write_batch_test: db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 $(MEMENVLIBRARY) : $(MEMENVOBJECTS)
 	rm -f $@
 	$(AR) -rs $@ $(MEMENVOBJECTS)
 
 memenv_test : helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS)
-	$(CXX) helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
+	$(CXX) helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS) -o $@ $(xLDFLAGS) $(PLATFORM_EXTRALIBS)
 
 ifeq ($(PLATFORM), IOS)
 # For iOS, create universal object files to be used on both the simulator and
@@ -179,22 +179,22 @@ IOSVERSION=$(shell defaults read $(PLATFORMSROOT)/iPhoneOS.platform/version CFBu
 
 .cc.o:
 	mkdir -p ios-x86/$(dir $@)
-	$(SIMULATORROOT)/usr/bin/$(CXX) $(CXXFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -c $< -o ios-x86/$@
+	$(SIMULATORROOT)/usr/bin/$(CXX) $(xCXXFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -c $< -o ios-x86/$@
 	mkdir -p ios-arm/$(dir $@)
-	$(DEVICEROOT)/usr/bin/$(CXX) $(CXXFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 -c $< -o ios-arm/$@
+	$(DEVICEROOT)/usr/bin/$(CXX) $(xCXXFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 -c $< -o ios-arm/$@
 	lipo ios-x86/$@ ios-arm/$@ -create -output $@
 
 .c.o:
 	mkdir -p ios-x86/$(dir $@)
-	$(SIMULATORROOT)/usr/bin/$(CC) $(CFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -c $< -o ios-x86/$@
+	$(SIMULATORROOT)/usr/bin/$(CC) $(xCFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -c $< -o ios-x86/$@
 	mkdir -p ios-arm/$(dir $@)
-	$(DEVICEROOT)/usr/bin/$(CC) $(CFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 -c $< -o ios-arm/$@
+	$(DEVICEROOT)/usr/bin/$(CC) $(xCFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 -c $< -o ios-arm/$@
 	lipo ios-x86/$@ ios-arm/$@ -create -output $@
 
 else
 .cc.o:
-	$(CXX) $(CXXFLAGS) -c $< -o $@
+	$(CXX) $(xCXXFLAGS) -c $< -o $@
 
 .c.o:
-	$(CC) $(CFLAGS) -c $< -o $@
+	$(CC) $(xCFLAGS) -c $< -o $@
 endif