通过Homebrew安装gfortran以支持numpy

Question

我想用brew安装一个可以用的numpy版本。但是输入brew install numpy后，出现了这样的提示：

==> 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

运行brew doctor是正常的，所以可能是缺少fortran编译器的问题。可以试试：brew install gfortran

Error: No available formula for gfortran 

嗯，从brew的评论中可以看到，在GitHub问题追踪器上，gfortran似乎已经不在brew里了。我们可以试着从项目网站下载gfortran 4.9.0，并设置FC=\path\to\gfortran，这样brew就知道要使用这个了。

==> 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

可恶，brew不想使用非默认的fortran编译器。我现在用的是OSX 10.9，默认安装了llvm，所以对添加gcc有点担心。因为当llvm接管时，很多程序都需要重新编译，所以再次更改默认编译器似乎很危险。

如果有人能给我一些建议，让brew顺利完成安装，那就太好了。

Answer 1

在终端里输入 brew install gcc 这个命令。

现在，Numpy 的安装可以顺利进行啦。