Build Error

[mrfusion [acidb0x]]

mail# uname -a
FreeBSD mail.acidb0x.org 4.6.2-RELEASE FreeBSD 4.6.2-RELEASE #0: Fri Jun  6
06:17:32 EDT 2003     address@hidden:/usr/src/sys/compile/acidb0x
i386

mail# ./configure --prefix=/usr/local/ntp && make && make install


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