Still working on the validator buildbot as I can. Now I'm tackling what appears to be a configure problem for llvm-gcc-4.2. Here's the configure log: ../src/configure --prefix=/ptmp/dag/buildbot/slaves/llvm-validate/llvm-validate-release-kentsfield-linux/build/install --program-prefix=llvm- --enable-llvm=/ptmp/dag/buildbot/slaves/llvm-validate/llvm-validate-release-kentsfield-linux/build/llvm-initial/obj --enable-languages=c,c++ creating cache ./config.cache checking host system type... config.sub: missing argument Try `config.sub --help' for more information. checking target system type... config.sub: missing argument Try `config.sub --help' for more information. checking build system type... config.sub: missing argument Try `config.sub --help' for more information. checking for a BSD compatible install... /usr/bin/install -c checking whether ln works... yes [...] This eventually leads to a failure to find genmodes during boostrap so everything blows up. If I run this in the shell, it appears to work fine. More strangely, this only fails on release builds. A debug build buildbot finishes just fine. Anyone seen anything like this before? -Dave