Warnings and errors encountered when installing nmap on Mac lion

Warnings and errors encountered when installing nmap on Mac lion

I was installing nmap from source when i hit this
checking sys/bufmod.h usability... no
checking sys/bufmod.h presence... no
checking for sys/bufmod.h... no
checking sys/dlpi.h usability... no
checking sys/dlpi.h presence... no
checking for sys/dlpi.h... no
checking sys/dlpihdr.h usability... no
checking sys/dlpihdr.h presence... no
checking for sys/dlpihdr.h... no
checking sys/dlpi_ext.h usability... no
checking sys/dlpi_ext.h presence... no
checking for sys/dlpi_ext.h... no
checking sys/ioctl.h usability... yes
checking sys/ioctl.h presence... yes
checking for sys/ioctl.h... yes
checking sys/mib.h usability... no
checking sys/mib.h presence... no
checking for sys/mib.h... no
checking sys/ndd_var.h usability... no
checking sys/ndd_var.h presence... no
checking for sys/ndd_var.h... no
checking net/pfilt.h usability... no
checking net/pfilt.h presence... no
checking for net/pfilt.h... no
checking net/pfvar.h usability... no
checking net/pfvar.h presence... no
checking for net/pfvar.h... no
checking net/radix.h usability... no
checking net/radix.h presence... no
checking for net/radix.h... no
checking net/raw.h usability... no
checking net/raw.h presence... no
checking for net/raw.h... no
There are more files with these ... no ... no, etc Where can i find these
files? I am running Mac Lion 10.7 with Xcode command line tools installed.
Interestingly I found this
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: see the Autoconf documentation
configure: WARNING: net/if.h: section "Present But Cannot Be Compiled"
configure: WARNING: net/if.h: proceeding with the preprocessor's result
configure: WARNING: net/if.h: in the future, the compiler will take
precedence
checking for net/if.h... yes
checking netinet/ip_fw.h usability... no
checking netinet/ip_fw.h presence... yes
configure: WARNING: netinet/ip_fw.h: present but cannot be compiled
configure: WARNING: netinet/ip_fw.h: check for missing prerequisite
headers?
configure: WARNING: netinet/ip_fw.h: see the Autoconf documentation
configure: WARNING: netinet/ip_fw.h: section "Present But Cannot Be
Compiled"
configure: WARNING: netinet/ip_fw.h: proceeding with the preprocessor's
result
configure: WARNING: netinet/ip_fw.h: in the future, the compiler will take
precedence
checking for netinet/ip_fw.h... yes
How could this come about? net/if.h is present but cannot be compiled. How
can i make it so?
Hope to hear from the gurus out there!