Homebrew error on Mojave

➜ ~ brew upgrade imagemagick
Updating Homebrew…
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
No changes to formulae.
==> Upgrading 1 outdated package, with result:
imagemagick 7.0.8–0 -> 7.0.8–6
==> Upgrading imagemagick
Error: The Command Line Tools header package must be installed on Mojave.
The installer is located at:

Install .pkg file which the Terminal mentioned manually

$ cd /Library/Developer/CommandLineTools/Packages/
$ open .

Then, click “macOS_SDK_headers_for_macOS_10.14.pkg”.

This step will take a couple of minutes. Then you can start using brew upgrade command.

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