'Install graph-tool for Anaconda Python3.6.3 on macOS X

How can I install graph-tool for Anaconda Python 3.6.3 on macOS High Sierra? (I've been able to install graph-tool for Python 2.7.10.) Thanks!

I followed the instructions and first tried

brew tap homebrew/science

but got "Error: homebrew/science was deprecated. This tap is now empty as all its formulae were migrated." Anyhow, I found a solution (forgot the exact brew command) and ran

brew install graph-tool

It now says "Warning: brewsci/science/graph-tool 2.26_1 is already installed". I can then import graph-tool from python 2.7,

$ /usr/bin/python2.7
>>> from graph_tool.all import *

but not from the anaconda distribution,

$ python
Python 3.6.3 |Anaconda custom (64-bit)| (default, Oct  6 2017, 12:04:38) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from graph_tool.all import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'graph_tool'


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