cannot upgrade from 10-BETA3 to latest 10

[John]

Hello stables,

I cannot upgrade from 10-beta3 to latest (as of 19th Dec). I get the
following error:

/usr/bin/ld: cannot find /usr/lib/libc_nonshared.a
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

Sources version info:
svnlite info:
Path: .
Working Copy Root Path: /usr/src
URL: https://svn0.eu.freebsd.org/base/releng/10.0
Relative URL: ^/releng/10.0
Repository Root: https://svn0.eu.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 259623
Node Kind: directory
Schedule: normal
Last Changed Author: np
Last Changed Rev: 259623
Last Changed Date: 2013-12-19 19:39:24 +0000 (Thu, 19 Dec 2013)

Here is the full error:

==> etc/sendmail (obj)
/usr/obj/usr/src/etc/sendmail created for /usr/src/etc/sendmail

--------------------------------------------------------------
>>> stage 2.3: build tools
--------------------------------------------------------------
cd /usr/src; MAKEOBJDIRPREFIX=/usr/obj  INSTALL="sh
/usr/src/tools/install.sh"
PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:/usr/obj/usr/src/tmp/legacy/usr/games:/usr/obj/usr/src/tmp/legacy/bin:/sbin:/bin:/usr/sbin:/usr/bin
WORLDTMP=/usr/obj/usr/src/tmp  VERSION="FreeBSD 10.0-RC2 amd64 1000510"
MAKEFLAGS="-m /usr/src/tools/build/mk  -m /usr/src/share/mk"
COMPILER_TYPE=clang make  -f Makefile.inc1  TARGET=amd64
TARGET_ARCH=amd64  DESTDIR=  BOOTSTRAPPING=1000500  SSP_CFLAGS=
-DNO_LINT  -DNO_CPU_CFLAGS -DNO_WARNS -DNO_CTF -DEARLY_BUILD build-tools
===> bin/csh (obj,build-tools)
grep 'ERR_' /usr/src/bin/csh/../../contrib/tcsh/sh.err.c | grep
'^#define' >> sh.err.h
clang -E -O2 -pipe -I. -I/usr/src/bin/csh
-I/usr/src/bin/csh/../../contrib/tcsh -D_PATH_TCSHELL='"/bin/csh"'
-DNO_NLS_CATALOGS -std=gnu99 -I/usr/obj/usr/src/tmp/legacy/usr/include
/usr/src/bin/csh/../../contrib/tcsh/tc.const.c
/usr/src/bin/csh/../../contrib/tcsh/sh.char.h /usr/src/bin/csh/config.h
/usr/src/bin/csh/../../contrib/tcsh/config_f.h
/usr/src/bin/csh/../../contrib/tcsh/sh.types.h sh.err.h -D_h_tc_const |
grep 'Char STR' |  sed -e 's/Char \([a-zA-Z0-9_]*\)\(.*\)/extern Char
\1[];/' |  sort >> tc.const.h
clang -o gethost  -L/usr/obj/usr/src/tmp/legacy/usr/lib -O2 -pipe -I.
-I/usr/src/bin/csh -I/usr/src/bin/csh/../../contrib/tcsh
-D_PATH_TCSHELL='"/bin/csh"' -DNO_NLS_CATALOGS -std=gnu99
-I/usr/obj/usr/src/tmp/legacy/usr/include
/usr/src/bin/csh/../../contrib/tcsh/gethost.c
/usr/bin/ld: cannot find /usr/lib/libc_nonshared.a
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
*** Error code 1

Stop.
make[3]: stopped in /usr/src/bin/csh
*** Error code 1

Stop.
make[2]: stopped in /usr/src
*** Error code 1

Stop.
make[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src

How can I fix this?

thanks,

-- 
John