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我能够（经过一番挣扎）pip install networkit在python3.6 anaconda环境中安装networkit（我在Mac OSX high sierra上）。为了使 networkit 工作，我必须安装一个支持 OpenMp 的 g++ 编译器，所以我选择了brew install gcc. 安装很顺利，但是导入模块时出现错误

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-0547b3a80fd8> in <module>()
----> 1 import networkit

//anaconda/envs/py36/lib/python3.6/site-packages/networkit/__init__.py in <module>()
     41 # local imports
     42 from . import stopwatch
---> 43 from . import graph
     44 from . import graphio
     45 from . import community

//anaconda/envs/py36/lib/python3.6/site-packages/networkit/graph.py in <module>()
      1 # extension imports
----> 2 from _NetworKit import Graph, SpanningForest, GraphTools, RandomMaximumSpanningForest, UnionMaximumSpanningForest

ImportError: dlopen(//anaconda/envs/py36/lib/python3.6/site-packages/_NetworKit.cpython-36m-darwin.so, 2): Symbol not found: _GOMP_parallel
  Referenced from: //anaconda/envs/py36/lib/python3.6/site-packages/_NetworKit.cpython-36m-darwin.so
  Expected in: flat namespace
 in //anaconda/envs/py36/lib/python3.6/site-packages/_NetworKit.cpython-36m-darwin.so

我认为这取决于我没有使用 Homebrew gcc 而是使用不支持 OpenMP 的默认 Apple Clang 的事实。我的问题是：如何设置g++-7为默认编译器，以便让我的 networkit 模块启动并运行？

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