clang/tblgen: undefined reference to `futimens' c++: error: linker command failed with exit

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Running 

11.0-CURRENT FreeBSD 11.0-CURRENT #2 r277382: Mon Jan 19 16:10:34 CET 2015
amd64

with source tree at revision 
>>> Updating /usr/src using Subversion
- --------------------------------------------------------------
Updating '.':
At revision 280275.

and "make buildorld buildkernel"

fails at the below shown point.

The /usr/obj tree is clean - I delete it prior to each build run.

Something is out of sync, sn earlier update process (make installworld) crashed
and I think the kernel, binary tools and rest of sources are some kind of out
of sync.

Is there a way - from the data shown - to resolve the problem?

Building a kernel works great, building toolchains fail also at the very same
point.

Thanks in advance,

oh


[...]
- --- _bootstrap-tools-usr.bin/clang/tblgen ---
- --- TableGen.o ---
c++ -O2 -pipe -O3 -pipe -O3
- -I/usr/src/usr.bin/clang/tblgen/../../../contrib/llvm/include
- -I/usr/src/usr.bin/clang/tblgen/../../../contrib/llvm/tools/clang/include
- -I/usr/src/usr.bin/clang/tblgen/../../../contrib/llvm/utils/TableGen -I.
- -I/usr/src/usr.bin/clang/tblgen/../../../contrib/llvm/../../lib/clang/include
- -DLLVM_ON_UNIX -DLLVM_ON_FREEBSD -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
- -fno-strict-aliasing
- -DLLVM_DEFAULT_TARGET_TRIPLE=\"x86_64-unknown-freebsd11.0\"
- -DLLVM_HOST_TRIPLE=\"x86_64-unknown-freebsd11.0\" -DDEFAULT_SYSROOT=\"\"
- -Qunused-arguments -I/usr/obj/usr/src/tmp/legacy/usr/include -std=c++11
- -std=c++11 -fno-exceptions -fno-rtti -stdlib=libc++ -Wno-c++11-extensions
- -c /usr/src/usr.bin/clang/tblgen/../../../contrib/llvm/utils/TableGen/TableGen.cpp
- -o TableGen.o --- _bootstrap-tools-usr.bin/clang/clang-tblgen
- --- /usr/obj/usr/src/tmp/usr/src/usr.bin/clang/clang-tblgen/../../../lib/clang/libllvmsupport/libllvmsupport.a(Path.o):
In function `llvm::sys::fs::setLastModificationAndAccessTime(int,
llvm::sys::TimeValue)': /usr/src/lib/clang/libllvmsupport/../../../contrib/llvm/lib/Support/Path.cpp:(.text+0x4649):
undefined reference to `futimens' c++: error: linker command failed with exit
code 1 (use -v to see invocation) *** [clang-tblgen] Error code 1

make[3]: stopped in /usr/src/usr.bin/clang/clang-tblgen
1 error
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