Warning instaling python-2.3.5 on FreeBSD 5.3

[spanov at naumen.ru]

i've got problem installing python-2.3.5 from sources on FreeBSD 5.3

root at server# ./configure > conf_log
configure: WARNING: curses.h: present but cannot be compiled
configure: WARNING: curses.h:     check for missing prerequisite
headers?
configure: WARNING: curses.h: see the Autoconf documentation
configure: WARNING: curses.h:     section "Present But Cannot Be
Compiled"
configure: WARNING: curses.h: proceeding with the preprocessor's result
configure: WARNING: curses.h: in the future, the compiler will take
precedence
configure: WARNING:     ## --------------------------------- ##
configure: WARNING:     ## Report this to the python lists.  ##
configure: WARNING:     ## --------------------------------- ##
configure: WARNING: ncurses.h: present but cannot be compiled
configure: WARNING: ncurses.h:     check for missing prerequisite
headers?
configure: WARNING: ncurses.h: see the Autoconf documentation
configure: WARNING: ncurses.h:     section "Present But Cannot Be
Compiled"
configure: WARNING: ncurses.h: proceeding with the preprocessor's
result
configure: WARNING: ncurses.h: in the future, the compiler will take
precedence
configure: WARNING:     ## --------------------------------- ##
configure: WARNING:     ## Report this to the python lists.  ##
configure: WARNING:     ## --------------------------------- ##

Can anybody explain me what kind of problem do i have and how much
serious it could be?
Will be gratefull for any help. Sorry, english is not my native
language :)