configure warning

[ashokrags]

Got this warning from ./configure

configure: WARNING: boost/unordered_map.hpp: present but cannot be compiled
configure: WARNING: boost/unordered_map.hpp:     check for missing prerequisite headers?
configure: WARNING: boost/unordered_map.hpp: see the Autoconf documentation
configure: WARNING: boost/unordered_map.hpp:     section "Present But Cannot Be Compiled"
configure: WARNING: boost/unordered_map.hpp: proceeding with the preprocessor's result
configure: WARNING: boost/unordered_map.hpp: in the future, the compiler will take precedence
configure: WARNING:     ## ------------------------------- ##
configure: WARNING:     ## Report this to gt1@sanger.ac.uk ##
configure: WARNING:     ## ------------------------------- ##
checking for boost/unordered_map.hpp... yes
checking whether boost::unordered_map exists... no
checking boost/unordered_set.hpp usability... no
checking boost/unordered_set.hpp presence... yes
configure: WARNING: boost/unordered_set.hpp: present but cannot be compiled
configure: WARNING: boost/unordered_set.hpp:     check for missing prerequisite headers?
configure: WARNING: boost/unordered_set.hpp: see the Autoconf documentation
configure: WARNING: boost/unordered_set.hpp:     section "Present But Cannot Be Compiled"
configure: WARNING: boost/unordered_set.hpp: proceeding with the preprocessor's result
configure: WARNING: boost/unordered_set.hpp: in the future, the compiler will take precedence
configure: WARNING:     ## ------------------------------- ##
configure: WARNING:     ## Report this to gt1@sanger.ac.uk ##
configure: WARNING:     ## ------------------------------- ##