error: type qualifiers ignored on function return type

[nkhine]

Hello,
I am trying to build this on CentOS, and get this error:

In file included from ./libmemcached-1.0/memcached.h:113:0,
                 from ./libmemcached/common.h:125,
                 from ./libmemcached/csl/common.h:50,
                 from libmemcached/csl/context.cc:38:
./libmemcached-1.0/server.h:118:74: error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers]
 const bool has_memcached_server_ipaddress(const memcached_server_st *self);
                                                                          ^
./libmemcached-1.0/server.h:121:78: error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers]
 const bool has_memcached_instance_ipaddress(const memcached_instance_st *self);
                                                                              ^
cc1plus: all warnings being treated as errors
make[1]: *** [libmemcached/csl/libmemcached_libmemcached_la-context.lo] Error 1
make[1]: Leaving directory `/root/aws-elasticache-cluster-client-libmemcached'
make: *** [all] Error 2

how do i install this on CentoOS?