Problem building net-snmp on 5.1-release-p10

Hello

I'm trying to build net-snmp but I get this build error:

mv -f host/.libs/hr_system.lo host/hr_system.lo
/bin/sh ../../libtool --mode=compile cc -I../../include -I../../include 
  -I. -I../.. -I. -I./../..  -I./../../snmplib -I./.. -I..   -DINET6 -O 
-pipe -march=pentium3 -Dfreebsd5 -c -o host/hr_storage.lo host/hr_storage.c
rm -f host/.libs/hr_storage.lo
cc -I../../include -I../../include -I. -I../.. -I. -I./../.. 
-I./../../snmplib -I./.. -I.. -DINET6 -O -pipe -march=pentium3 
-Dfreebsd5 -c host/hr_storage.c  -fPIC -DPIC -o host/.libs/hr_storage.lo
In file included from host/hr_storage.c:36:
/usr/include/machine/types.h:50: redefinition of `vm_offset_t'
/usr/include/sys/types.h:250: `vm_offset_t' previously declared here
/usr/include/machine/types.h:51: redefinition of `vm_ooffset_t'
/usr/include/sys/types.h:251: `vm_ooffset_t' previously declared here
/usr/include/machine/types.h:55: redefinition of `vm_paddr_t'
/usr/include/sys/types.h:252: `vm_paddr_t' previously declared here
/usr/include/machine/types.h:57: conflicting types for `vm_pindex_t'
/usr/include/sys/types.h:253: previous declaration of `vm_pindex_t'
/usr/include/machine/types.h:58: redefinition of `vm_size_t'
/usr/include/sys/types.h:254: `vm_size_t' previously declared here
/usr/include/machine/types.h:60: redefinition of `register_t'
/usr/include/sys/types.h:203: `register_t' previously declared here
/usr/include/machine/types.h:61: redefinition of `u_register_t'
/usr/include/sys/types.h:237: `u_register_t' previously declared here
*** Error code 1

Stop in /usr/ports/net/net-snmp/work/net-snmp-5.0.9/agent/mibgroup.
*** Error code 1

Stop in /usr/ports/net/net-snmp/work/net-snmp-5.0.9/agent.
*** Error code 1

Stop in /usr/ports/net/net-snmp/work/net-snmp-5.0.9.
*** Error code 1

Stop in /usr/ports/net/net-snmp.

Does anyone know what I can do about this?

/John