使用conda安装gcc

安装apex和一些包时，常常能见到报错：

                                 !! WARNING !!

  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Your compiler (g++ 4.8.5) may be ABI-incompatible with PyTorch!
  Please use a compiler that is ABI-compatible with GCC 4.9 and above.
  See https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html.

  See https://gist.github.com/goldsborough/d466f43e8ffc948ff92de7486c5216d6
  for instructions on how to install GCC 4.9 or higher.
  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

                                !! WARNING !!

但是有时，我们无法更改系统的gcc版本，这时conda可以帮助我们。

解决方案：

有代理的情况下：

proxychains4 conda install https://anaconda.org/brown-data-science/gcc/5.4.0/download/linux-64/gcc-5.4.0-0.tar.bz2

没有代理的话，也可以先wget下载到本地，然后conda install gcc-5.4.0-0.tar.bz2。