MacOS brew install mono-libdgiplus failure

[michaelgsharp]

Description
After the recent changes to the MacOS hosted pool, when doing brew install mono-libgdiplus it lists [email protected] as a dependency. This dependency fails to install with this error:

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3
Target /usr/local/bin/2to3
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3'

Python 3.9 did not used to be a dependency (prior passing build), but has been added recently (recent failed build)

Area for Triage:
Apple

Question, Bug, or Feature?:
Bug

Virtual environments affected

• macOS 10.14

Expected behavior
Since python 3.9 is already installed, I expected either the installation to not happen, or to not fail.

Actual behavior
Install fails because python 3.9 is already installed.

Repro steps

1. Run build pipeline in MacOS Hosted pool
2. brew install mono-libgdiplus

[michaelgsharp]

I see you already have a PR merged in (#2326) just waiting for the image rollout. Do you have a rough ETA on when that may happen?

[al-cheb]

Hello, @michaelgsharp
Sorry for the inconvenience. Waiting for a new image rollout with fix - #2326. Temporary workaround - #2322 (comment). I hope in a week.

[michaelgsharp]

Thanks for the workaround, I will go ahead and apply that. Thanks for your help and quick response!

[michaelgsharp]

Closing this issue as the provided workaround worked and builds passed.