qt@5.5 fails to configure on MacOS Mojave 10.14

[kmz42]

gist: https://gist.github.com/kurtmueller42/ff2d7738aaef3db610ea35b386145466

Reproduction:

1. Installed homebrew on a newly setup macbook pro High Sierra
2. Installed MacOS Mojave
3. brew install qt55

[fxcoudert]

Given that qt@5.5 is not supported on Mojave, and it fails to build, there are two options for us:

• declare it unsupported with depends_on MaximumMacOSRequirement => :high_sierra
• remove it altogether, since it does not follow the requirements for versioned formulas: https://docs.brew.sh/Versions

[eagletmt]

Same here with High Sierra.
It seems to be caused by Xcode upgrade (10.0), not OS upgrade.

[fxcoudert]

It can be the Xcode 10 toolchain, or the 10.14 SDK (which is now used by default on High Sierra with Xcode 10).

[MikeMcQuaid]

@fxcoudert I reckon remove it 👍.

[MahmoudFayed]

I understand your decision to delete qt@5.5, but we distributed projects that uses this formula.
Now our projects including (The Ring programming language - version 1.8 for macOS) will not work!
Where is the backup for this formula? So we can install it on old macOS versions?

[MikeMcQuaid]

I understand your decision to delete qt@5.5, but we distributed projects that uses this formula.
Now our projects including (The Ring programming language - version 1.8 for macOS) will not work!
Where is the backup for this formula? So we can install it on old macOS versions?

brew extract --help should help you.

[fxcoudert]

If you are hosting formulas that use qt@5.5, you can extract the formula from Core (as it was before we removed it) and host it yourself.

[MahmoudFayed]

Thanks

[alexventuraio]

I have install Mojave OS X form scratch and now when I execute brew install qt55 I got the following errors:

Error: No available formula with the name "qt55"
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/core)" fetch --unshallow

Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps.

Is there anyway to be able to install Qt 5.5?

[fxcoudert]

Not from Homebrew core, we do not provide this version anymore, as it failed to build on recent macOS versions.