doc: update macOS specific guide for MacPorts

Add comment for the setup failure.
The solution can be infered from ARMmbed/cmsis-pack-manager#97
Fixes #18269.
Signed-off-by: Chen Guokai <1415430544@qq.com>
This commit is contained in:
Chen Guokai 2019-08-15 18:09:04 +08:00 committed by Carles Cufí
commit 82da4c57a7

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@ -50,3 +50,9 @@ Now install these host dependencies with the ``brew`` command:
brew install cmake ninja gperf ccache dfu-util qemu dtc python3
.. _Homebrew site: https://brew.sh/
Additional notes for MacPorts users
***********************************
While MacPorts is not officially supported in this guide, it is possible to use MacPorts instead of Homebrew to get all the required dependencies on macOS.
Note also that you may need to install ``rust`` and ``cargo`` for the Python dependencies to install correctly.