Unexpected error in "make buildkernel"

Hello:

Please answer me directly because I'm not subscribe to the list.

I was trying to update my FreeBSD-5.0-DP1 and when I exec:
make buildkernel this error appears just at the end of the process:

sh /home2/src/sys/conf/newvers.sh GENERIC
cc -c -O -pipe -mcpu=pentiumpro -Wall -Wredundant-decls -Wnested-externs 
-Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline 
-Wcast-qual  -fformat-extensions -std=c99 -g -nostdinc -I-  -I. 
-I/home2/src/sys -I/home2/src/sys/dev -I/home2/src/sys/contrib/dev/acpica 
-I/home2/src/sys/contrib/ipfilter -D_KERNEL -include opt_global.h -fno-common  
-mno-align-long-strings -mpreferred-stack-boundary=2 -ffreestanding -Werror  
vers.c
linking kernel.debug
/usr/libexec/elf/ld: target elf32-i386-freebsd not found
*** Error code 1

Stop in /usr/obj/home2/src/sys/GENERIC.
*** Error code 1

Stop in /home2/src.
*** Error code 1

What's this ? where's the problem ?
Thanks :)

-- 
JFRH