linuxthreads compile error in latest 6.0-BETA1

Hi,

I have FreeBSD 6.0 beta1 and I couldn't compile linuxthreads from ports.
How can I compile it successfully?

thanks in advance,

Ganbold

daemon# uname -an
FreeBSD daemon.ub.mng.net 6.0-BETA1 FreeBSD 6.0-BETA1 #0: Tue Jul 19 
14:50:06 ULAST 
2005     tsgan_at_daemon.ub.mng.net:/usr/obj/usr/src/sys/DAEMON  i386
daemon#

cc -O2 -fno-strict-aliasing -pipe   -D_PTHREADS -I../ -I../sysdeps/i386 
-I../sysdeps/pthread -I../sysdeps/unix/sysv/linux -fexceptions -DIN_GCC 
-DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -DFINE_GRAINED_LIBRARIES -D_PTHREADS 
-DGTHREAD_USE_WEAK 
-I/usr/src/gnu/lib/libgcc/../../usr.bin/cc/cc_tools 
-I/usr/src/gnu/lib/libgcc/../../../contrib/gcc/config 
-I/usr/src/gnu/lib/libgcc/../../../contrib/gcc -I.  -c 
/usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c
In file included from ../sysdeps/pthread/pthread.h:27,
                  from 
/usr/src/gnu/lib/libgcc/../../../contrib/gcc/gthr-posix.h:43,
                  from /usr/src/gnu/lib/libgcc/../../../contrib/gcc/gthr.h:83,
                  from 
/usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c:42:
../sysdeps/pthread/bits/pthreadtypes.h:51: error: conflicting types for 
'pthread_attr_t'
/usr/include/sys/_pthreadtypes.h:65: error: previous declaration of 
'pthread_attr_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:59: error: conflicting types for 
'pthread_cond_t'
/usr/include/sys/_pthreadtypes.h:68: error: previous declaration of 
'pthread_cond_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:66: error: conflicting types for 
'pthread_condattr_t'
/usr/include/sys/_pthreadtypes.h:69: error: previous declaration of 
'pthread_condattr_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:69: error: conflicting types for 
'pthread_key_t'
/usr/include/sys/_pthreadtypes.h:70: error: previous declaration of 
'pthread_key_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:82: error: conflicting types for 
'pthread_mutex_t'
/usr/include/sys/_pthreadtypes.h:66: error: previous declaration of 
'pthread_mutex_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:89: error: conflicting types for 
'pthread_mutexattr_t'
/usr/include/sys/_pthreadtypes.h:67: error: previous declaration of 
'pthread_mutexattr_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:93: error: conflicting types for 
'pthread_once_t'
/usr/include/sys/_pthreadtypes.h:71: error: previous declaration of 
'pthread_once_t' was here
../sysdeps/pthread/bits/pthreadtypes.h:139: error: conflicting types for 
'pthread_t'
/usr/include/sys/_pthreadtypes.h:64: error: previous declaration of 
'pthread_t' was here
*** Error code 1

Stop in /usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_16/libgcc_r.
*** Error code 1

Stop in /usr/ports/devel/linuxthreads.