bug report

[Fanie Smith]

I am trying to compile ntop version 2.1.55 on OpenBSD 3.2

gcc version 2.95.3
automake 1.7.2
autoconf 2.57
gdchart .94c

configure as: 
./configure --enable-automake171 --with-rrd-root=/usr/local/rrdtool-1.0.40/

I get the following errors in configure

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/in_systm.h usability... yes
checking netinet/in_systm.h presence... yes
checking for netinet/in_systm.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/tcp.h usability... yes