Bug report - autoconf

[Goncalo Costa]

While running ./configure for ntop-2.2c under 

# uname -a
SunOS sun2 5.8 Generic_108528-20 sun4u sparc SUNW,UltraSPARC-IIi-cEngine

I got the following :

checking net/if.h usability... no
checking net/if.h presence... yes
configure: WARNING: net/if.h: present but cannot be compiled
configure: WARNING: net/if.h: check for missing prerequisite headers?
configure: WARNING: net/if.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for net/if.h... yes

checking netinet/if_ether.h usability... no
checking netinet/if_ether.h presence... yes
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:     ## ------------------------------------ ##
checking for netinet/if_ether.h... yes

checking netinet/ip.h usability... no
checking netinet/ip.h presence... yes
configure: WARNING: netinet/ip.h: present but cannot be compiled
configure: WARNING: netinet/ip.h: check for missing prerequisite headers?
configure: WARNING: netinet/ip.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for netinet/ip.h... yes

checking netinet/ip_icmp.h usability... no
checking netinet/ip_icmp.h presence... yes
configure: WARNING: netinet/ip_icmp.h: present but cannot be compiled
configure: WARNING: netinet/ip_icmp.h: check for missing prerequisite headers?
configure: WARNING: netinet/ip_icmp.h: proceeding with the preprocessor's 
result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for netinet/ip_icmp.h... yes

checking netinet/udp.h usability... no
checking netinet/udp.h presence... yes
configure: WARNING: netinet/udp.h: present but cannot be compiled
configure: WARNING: netinet/udp.h: check for missing prerequisite headers?
configure: WARNING: netinet/udp.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for netinet/udp.h... yes

As requested by the output messages I'm reporting this.

Regards
Goncalo