If you are building with nvcc on OS X and get errors along the lines of "clang error: unsupported option '-dumpspecs'" - welcome to the new build world.
The best fix I've found so far is to replace the /usr/bin/cc and /usr/bin/c++ symlinks (which currently go to clang) with symlinks to llvm-gcc.
sudo rm /usr/bin/cc
sudo rm /usr/bin/c++
sudo ln /usr/bin/llvm-gcc /usr/bin/cc
sudo ln /usr/bin/llvm-g++ /usr/bin/c++
Try that out and see if it works! Please let me know if you find a better solution as well.
