Error: [email protected]: unknown version :mountain_lion

Question

Followed this tutorial in installing qt5.5 on a macOS version 10.13.6 High Sierra. Failed when trying to brew install [email protected] giving me an error below:

Error: [email protected]: unknown version :mountain_lion

Versions:

• brew
  Homebrew 2.0.0
  Homebrew/homebrew-core (git revision 175af; last commit 2019-02-02)
  Homebrew/homebrew-cask (git revision 05a81; last commit 2019-02-02)

• macOS version 10.13.6 High Sierra

any help?

Answer 1

Referring to the tutorial, the following steps are executed to install [email protected]

brew update
cd $( brew --prefix )/Homebrew/Library/Taps/homebrew/homebrew-core

# below is the last commit containing [email protected] with homebrew
git checkout 9ba3d6ef8891e5c15dbdc9333f857b13711d4e97 Formula/[email protected]

# here is where the error occurs
brew install [email protected]

Solution

turns out line 25 of [email protected] formula file checked out in the command ( as seen in the referred tutorial)

git checkout 9ba3d6ef8891e5c15dbdc9333f857b13711d4e97 Formula/[email protected]

is causing this problem. commenting it out fixes the issue