Auto merge of #23397 - servo:jdm-patch-44, r=KiChjang

Document gstreamer installation

Fixes #23394.

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bors-servo 2019-05-15 21:13:53 -04:00 committed by GitHub
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@ -58,6 +58,7 @@ Xcode version 10.2 or above is recommended.
``` sh
brew bundle install --file=etc/taskcluster/macos/Brewfile
brew bundle install --file=etc/taskcluster/macos/Brewfile-gstreamer
pip install virtualenv
```
##### On macOS (MacPorts)