linuxthreads not compiling

Hi,

- I have a 5.1-CURRENT system from 2003-July-10. 
- I tried to compile the linuxthreads package, but it failed. 
- From current.freebsd.org i downloaded the ports.tgz from 2003-July-11
- still linuxthreads isnt compiling

error looks like :

cc -O -pipe -mcpu=pentiumpro -mcpu=pentiumpro -g -O2 -Wall
-DCOMPILING_LINUXTHREADS
-I/usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_12
-I/usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_12/sysdeps/i386
-I/usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_12/sysdeps/pthre
ad
-I/usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_12/sysdeps/unix/
sysv/linux -I/usr/src/lib/libc/stdtime -DLIBC_RCS -DLINUXTHREADS
-D__USE_UNIX98 -D__USE_XOPEN2K -D_STACK_GROWS_DOWN -DNEWLIBC
-D_THREAD_SAFE   -c clone.S
clone.S:8:17: SYS.h: No such file or directory
{standard input}: Assembler messages:
{standard input}:55: Error: no such instruction: `kerncall'
*** Error code 1

Stop in /usr/ports/devel/linuxthreads/work/linuxthreads-2.2.3_12.
*** Error code 1

Stop in /usr/ports/devel/linuxthreads.

Any ideas ?

Regards kai