can't build svn clang under fresh ubuntu 14.04 x64/gcc4.9.2

i've followed the clang build-instructions on http://clang.llvm.org/get_started.html

on an recent ubuntu 14.04 x64 + gcc 4.9.2

using
llvm svn 228148
clang svn 228148
compiler-rt svn 228148

svn co + configures worked

make failed with