buildworld fails 9.1-STABLE -> 9.2.0-RELEASE

[John]

Hello freebsd-stable,

I have a buildworld failure upgrading 9.1-stable (r250633) to 9.2.0-release. 
I take these steps:

1. rm -rf /usr/obj
2. rm -rf /usr/src
3. mkdir /usr/obj
4. mkdir /usr/src
5. svn co https://svn0.eu.freebsd.org/base/release/9.2.0/ /usr/src 
(this results in Revision: 256108)
6. cd /usr/src
7. make clean && make clean (just to be sure)
8. make buildworld

This fails at the following point:

./contrib/llvm/tools/clang/lib/Basic/FileSystemStatCache.cpp 
/usr/src/lib/clang/libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic
/IdentifierTable.cpp /usr/src/lib/clang/libclangbasic/../../../contrib/llvm/
tools/clang/lib/Basic/LangOptions.cpp /usr/src/lib/clang/libclangbasic/../..
/../contrib/llvm/tools/clang/lib/Basic/Module.cpp /usr/src/lib/clang/
libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic/ObjCRuntime.cpp /usr
/src/lib/clang/libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic
/OpenMPKinds.cpp /usr/src/lib/clang/libclangbasic/../../../contrib/llvm/tools
/clang/lib/Basic/OperatorPrecedence.cpp /usr/src/lib/clang/libclangbasic/../..
/../contrib/llvm/tools/clang/lib/Basic/SourceLocation.cpp /usr/src/lib/clang/
libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic/SourceManager.cpp /usr
/src/lib/clang/libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic/
TargetInfo.cpp /usr/src/lib/clang/libclangbasic/../../../contrib/llvm/tools/
clang/lib/Basic/Targets.cpp /usr/src/lib/clang/libclangbasic/../../../contrib/
llvm/tools/clang/lib/Basic/TokenKinds.cpp /usr/src/lib/clang/libclangbasic/..
/../../contrib/llvm/tools/clang/lib/Basic/Version.cpp /usr/src/lib/clang/
libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic/VersionTuple.cpp
/usr/src/lib/clang/libclangbasic/../../../contrib/llvm/tools/clang/lib/Basic/
SourceManager.cpp:1100:10: fatal error:
      'emmintrin.h' file not found
#include <emmintrin.h>
         ^
1 error generated.
mkdep: compile failed
*** [.depend] Error code 1

Stop in /usr/src/lib/clang/libclangbasic.
*** [depend] Error code 1

Stop in /usr/src/lib/clang.
*** [cross-tools] Error code 1

Stop in /usr/src.
*** [_cross-tools] Error code 1

Stop in /usr/src.
*** [buildworld] Error code 1

Stop in /usr/src.

====================================================

I have no src.conf in /etc. make.conf looks like this:

CC=clang
CXX=clang++
CPP=clang-cpp

# added by use.perl 2013-05-14 02:01:08
PERL_VERSION=5.14.2

Can anyone help?
thanks,
-- 
John