net-snmp build problem under cygwin

when make net-snmp under cygwin, I got many errors below. anyone can
help with me handle these errors? thanks a lot

/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:82:2:
war
ning: #warning "fd_set and associated macros have been defined in
sys/types.
This can cause runtime problems with W32 sockets"
In file included from ./host_res.h:28,
from host/hr_swrun.c:82:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:89:
error
: redefinition of `struct timeval'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:108:
erro
r: redefinition of `struct linger'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:193:
erro
r: redefinition of `struct in_addr'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:224:
erro
r: redefinition of `struct sockaddr_in'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:278:
erro
r: redefinition of `struct ip_mreq'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:318:
erro
r: redefinition of `struct sockaddr'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:434:
erro
r: conflicting types for 'accept'
/usr/include/sys/socket.h:29: error: previous declaration of 'accept'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:434:
erro
r: conflicting types for 'accept'
/usr/include/sys/socket.h:29: error: previous declaration of 'accept'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:435:
erro
r: conflicting types for 'bind'
/usr/include/sys/socket.h:30: error: previous declaration of 'bind' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:435:
erro
r: conflicting types for 'bind'
/usr/include/sys/socket.h:30: error: previous declaration of 'bind' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:437:
erro
r: conflicting types for 'connect'
/usr/include/sys/socket.h:31: error: previous declaration of 'connect'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:437:
erro
r: conflicting types for 'connect'
/usr/include/sys/socket.h:31: error: previous declaration of 'connect'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:439:
erro
r: conflicting types for 'getpeername'
/usr/include/sys/socket.h:32: error: previous declaration of
'getpeername' was h
ere
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:439:
erro
r: conflicting types for 'getpeername'
/usr/include/sys/socket.h:32: error: previous declaration of
'getpeername' was h
ere
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:440:
erro
r: conflicting types for 'getsockname'
/usr/include/sys/socket.h:33: error: previous declaration of
'getsockname' was h
ere
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:440:
erro
r: conflicting types for 'getsockname'
/usr/include/sys/socket.h:33: error: previous declaration of
'getsockname' was h
ere
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:441:
erro
r: conflicting types for 'getsockopt'
/usr/include/sys/socket.h:44: error: previous declaration of
'getsockopt' was he
re
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:441:
erro
r: conflicting types for 'getsockopt'
/usr/include/sys/socket.h:44: error: previous declaration of
'getsockopt' was he
re
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:444:
erro
r: conflicting types for 'listen'
/usr/include/sys/socket.h:34: error: previous declaration of 'listen'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:444:
erro
r: conflicting types for 'listen'
/usr/include/sys/socket.h:34: error: previous declaration of 'listen'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:445:
erro
r: conflicting types for 'recv'
/usr/include/sys/socket.h:35: error: previous declaration of 'recv' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:445:
erro
r: conflicting types for 'recv'
/usr/include/sys/socket.h:35: error: previous declaration of 'recv' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:446:
erro
r: conflicting types for 'recvfrom'
/usr/include/sys/socket.h:37: error: previous declaration of 'recvfrom'
was here

/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:446:
erro
r: conflicting types for 'recvfrom'
/usr/include/sys/socket.h:37: error: previous declaration of 'recvfrom'
was here

/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:447:
erro
r: conflicting types for 'send'
/usr/include/sys/socket.h:39: error: previous declaration of 'send' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:447:
erro
r: conflicting types for 'send'
/usr/include/sys/socket.h:39: error: previous declaration of 'send' was
here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:448:
erro
r: conflicting types for 'sendto'
/usr/include/sys/socket.h:42: error: previous declaration of 'sendto'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:448:
erro
r: conflicting types for 'sendto'
/usr/include/sys/socket.h:42: error: previous declaration of 'sendto'
was here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:449:
erro
r: conflicting types for 'setsockopt'

Irene