kern/42450: 5.0.1 system fails to config kernel

[girokompas%ukr.net@localhost]

>Number:         42450
>Category:       kern
>Synopsis:       5.0.1 system fails to config kernel
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 14 19:55:00 +0000 2009
>Originator:     Vyacheslav Karpenko
>Release:        NetBSD-5.0.1
>Organization:
>Environment:
NetBSD Designer 5.0.1 NetBSD 5.0.1 (GENERIC) #0: Thu Jul 30 01:39:11 UTC 2009  
builds%b8.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-1-RELEASE/i386/200907292356Z-obj/home/builds/ab/netbsd-5-0-1-RELEASE/src/sys/arch/i386/compile/GENERIC
 i386

>Description:
New 5.0.1 system installed from scratch. src.tar.gz loaded from ftp.netbsd.org. 
# cd /usr/src/sys/arch/i386/conf
# config GENERIC
../../../../conf/files:4: your sources require a newer version of config(1) -- 
please rebuild it.
*** Stop.
# cd /usr/src/tools/config
# make
#      yacc  config/gram.c
/usr/src/tooldir.NetBSD-5.0.1-i386/bin/nbyacc     -d -o gram.c 
/usr/src/tools/config/../../usr.bin/config/gram.y
make: exec(/usr/src/tooldir.NetBSD-5.0.1-i386/bin/nbyacc) failed (No such file 
or directory)
*** Error code 1

Stop.
make: stopped in /usr/src/tools/config
# cd ../../usr.bin/conf
# make
#      yacc  config/gram.c
/usr/src/tooldir.NetBSD-5.0.1-i386/bin/nbyacc     -d -o gram.c gram.y
make: exec(/usr/src/tooldir.NetBSD-5.0.1-i386/bin/nbyacc) failed (No such file 
or directory)
*** Error code 1

Stop.
make: stopped in /usr/src/usr.bin/config


>How-To-Repeat:
load NetBSD-current src.tar.gz from ftp and try to make it.
>Fix:
Unknown.