configure warning

[Matt]

While installing nmap from the FreeBSD ports collection (which was just
re-cvsup'ed today) on a 4.7-STABLE box I received the following warning.
During the course of the make I received this group of warnings 3 times,
however, nmap did appear to install properly.

I am forwarding this message to you at the warnings request.  Please let
me know if I can offer you any other information.


configure: WARNING: netinet/if_ether.h: present but cannot be compiled
configure: WARNING: netinet/if_ether.h: check for missing prerequisite headers?
configure: WARNING: netinet/if_ether.h: proceeding with the preprocessor's 
result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##


Thanks

Matt