make fails due to undefined reference to clang::sema::HackForDefaultTemplateArg in TMetaUtils.cxx

Attempting to build root from trunk (version 5.99/-1) with Ubuntu 12.10 via ./configure and make. Everything seems to work until it tries to link TMetaUtils.o, at which point I get an "undefined reference to `clang::sema::HackForDefaultTemplateArg::HackForDefaultTemplateArg()'" (and the same message for the destructor). Output of "make -j 8" is attached.