macOS Sierra 10.12 : Homebrew can't brew upgrade Warning: We do not provide support for this pre-release version

Question

Yesterday I upgrade macOS Sierra, When I brew upgade,appeared error:

     Warning: You are using OS X 10.12.
     We do not provide support for this pre-release version.
     You may encounter build failures or other breakages.
     Please create pull-requests instead of filing issues.

I search long time for solve for this problem ,

eg:

sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

or:

 sudo chown $(whoami):admin /usr/local && sudo chown -R $(whoami):admin /usr/local

And then reboot OS,there are still this problem.

/usr/local exists already, it can be writed.

So,I don't use brew upgrade, please help,I have a long time can't use it.

Answer 1

I have same problem. This works for me:

Go to your terminal, type those command, change whoami to your username.

sudo chown -R $(whoami) /usr/local
xcode-select --install

You will give write permission to /usr/local and also you will download and install Command Line Developer Tools from Apple, it may take like 1~2 mins.

Try to run upgrade in case of you are seeing such error:Homebrew: Error: update-report should not be called directly

brew upgrade

Now do the update.

brew update

In the end you will see:

Homebrew no longer needs to have ownership of /usr/local. If you wish
you can return /usr/local to its default ownership with:   sudo chown
root:wheel /usr/local

just do it:

sudo chown root:wheel /usr/local

Answer 2

After trying everything else, the following code block finally did it for me ...

 cd "$(brew --repo)" && git fetch && git reset --hard origin/master && brew update

This code came from the brew README https://github.com/Homebrew/brew/#update-bug.
After running it, this is what I got ...

  ==> Migrating HOMEBREW_REPOSITORY (please wait)...
  Error: /usr/local/Homebrew already exists.
  Please remove it manually or uninstall and reinstall Homebrew into a new
  location as the migration cannot be done automatically.

I ignored the final error message, and went on with ...

  MacDePadre:local arick$ brew upgrade

I had a bunch of libraries that needed to be updated, so it took a long time, but this seemed to fix the problem.