Installing gfortran for numpy with homebrew

I want to install a working version of `numpy` using brew. `brew install numpy` gives the message: ``` ==> python setup.py build --fcompiler=gnu95 install --prefix=/usr/local/Cellar/numpy/1.8.1 File "/private/tmp/numpy-ncUw/numpy-1.8.1/numpy/distutils/fcompiler/gnu.py", line 197, in get_flags_opt v = self.get_version() File "/private/tmp/numpy-ncUw/numpy-1.8.1/numpy/distutils/fcompiler/__init__.py", line 434, in get_version raise CompilerNotFound() numpy.distutils.fcompiler.CompilerNotFound ``` `brew doctor` is okay, so it may actually be a missing fortran compiler problem. Try: `brew install gfortran` ``` Error: No available formula for gfortran ``` Huh. from the comments in the brew GitHub issue tracker, it looks like gfortran is no longer in brew. Let's try to download gfortran 4.9.0 from the project website and set `FC=\path\to\gfortran` so that brew knows to use it ``` ==> Building with an alternative Fortran compiler This is unsupported. Warning: No Fortran optimization information was provided. You may want to consider setting FCFLAGS and FFLAGS or pass the `--default-fortran-flags` option to `brew install` if your compiler is compatible with GCC. If you like the default optimization level of your compiler, ignore this warning. ==> Downloading https://downloads.sourceforge.net/project/numpy/NumPy/1.8.1/numpy-1.8.1.tar.gz Already downloaded: /Library/Caches/Homebrew/numpy-1.8.1.tar.gz ==> python setup.py build --fcompiler=gnu95 install --prefix=/usr/local/Cellar/numpy/1.8.1 File "/private/tmp/numpy-mrQk/numpy-1.8.1/numpy/distutils/fcompiler/gnu.py", line 197, in get_flags_opt v = self.get_version() File "/private/tmp/numpy-mrQk/numpy-1.8.1/numpy/distutils/fcompiler/__init__.py", line 434, in get_version raise CompilerNotFound() numpy.distutils.fcompiler.CompilerNotFound ``` Drat, so brew doesn't want to use a non-default fortran compiler. I'm using OSX 10.9 with llvm installed by default, so am wary about adding a gcc install. When llvm took over, many programs had to be re-compiled, and so changing the default compiler (again) seems dangerous. Any advice on how to get brew to complete the installation would be very welcome.