leveldb libraries for windows error

I follow the README build levelDB for windows, generate the leveldb.lib file. and when i test the demo, it always have an error :
```
undefined reference to `leveldb::Options::Options()'
```
my shell is :
```
g++ .\level_test.cc -o test -IE:\levelDB\leveldb-master\include -LE:\levelDB\leveldb-master\build\Release -leveldb
```
the level_test.cc only have a define :
```
leveldb::DB* db;
leveldb::Options options;
```
can anyone help me ? great thanks!