libmemcached配置出错

http://help.aliyun.com/view/11108324_13703944.html?spm=5176.7150518.1996836753.5.IunmYA
按照上面地址里面的教程配置环境，在配置libmemcached的时候收到如下提示，共3段内容，是在执行make命令之后得到的结果：

第1段内容：
libtest/unittest.cc: In function ?.est_return_t ASSERT_FALSE__TEST(void*)?.
libtest/unittest.cc:187: warning: format not a string literal and no format arguments
libtest/unittest.cc:187: warning: format not a string literal and no format arguments
libtest/unittest.cc:187: warning: format not a string literal and no format arguments
libtest/unittest.cc:187: warning: format not a string literal and no format arguments

第2段内容：
In file included from ./libtest/test.hpp:77,
                 from tests/libmemcached-1.0/mem_functions.cc:39:
./libtest/comparison.hpp: In function ?.ool libtest::_compare(const char*, int, const char*, const T1_comparable&, const T2_comparable&, bool) [with T1_comparable = uint64_t, T2_comparable = memcached_hash_t]?.
tests/libmemcached-1.0/mem_functions.cc:2779:   instantiated from here
./libtest/comparison.hpp:80: warning: comparison between signed and unsigned integer expressions

第3段内容：
In file included from ./libtest/test.hpp:77,
                 from tests/libmemcached-1.0/mem_functions.cc:39:
./libtest/comparison.hpp: In function ?.ool libtest::_compare(const char*, int, const char*, const T1_comparable&, const T2_comparable&, bool) [with T1_comparable = uint64_t, T2_comparable = memcached_hash_t]?.
tests/libmemcached-1.0/mem_functions.cc:2779:   instantiated from here
./libtest/comparison.hpp:80: warning: comparison between signed and unsigned integer expressions