fix examples/makefile for C example

examples/Makefile

@@ -13,8 +13,8 @@ column_families_example: column_families_example.cc
 compact_files_example: compact_files_example.cc
 	$(CXX) $(CXXFLAGS) $@.cc -o$@ ../librocksdb.a -I../include -O2 -std=c++11 $(PLATFORM_LDFLAGS) $(PLATFORM_CXXFLAGS) $(EXEC_LDFLAGS)
 
-simple_example-c:
-	$(CXX) $(CXXFLAGS) -xc $@.c -o$@ ../librocksdb.a -I../include -O2 $(PLATFORM_LDFLAGS) $(PLATFORM_CXXFLAGS) $(EXEC_LDFLAGS)
+simple_example-c: simple_example.c
+	$(CXX) -xc -I../include simple_example.c -L.. -lrocksdb -pthread -lsnappy -lbz2 -lz -lrt
 
 clean:
 	rm -rf ./simple_example ./column_families_example ./compact_files_example ./simple_example-c