Macvim from Homebrew formula missing ruby@4.0

まず brew install macvim で失敗を再現し、次に Homebrew formula と、その依存関係またはビルドのエントリーポイントを調べて、欠落している ruby@4.0 ライブラリを確認します。MacVim.app と mvim/gvim の両方から、--clean を付けた場合も含めて、MacVim をクリーンに起動できれば完了です。

Steps to reproduce

Install macvim via homebrew via brew install macvim and then either launch the macvim via GUI or terminal. The error message I got is:

dyld[20899]: Library not loaded: /opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib
Referenced from: <52A6DA3C-2DB7-33B3-B925-C83D0C432B8E> /opt/homebrew/Cellar/macvim/9.2.0321/MacVim.app/Contents/MacOS/Vim
Reason: tried: '/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file), '/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file)

Expected behaviour

Launch correctly

Version of MacVim

9.2.0321

MacVim installation method

Homebrew formula: brew install macvim

Environment

macOS 26.6.2

Logs and stack traces

dyld[20830]: Library not loaded: /opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib
  Referenced from: <52A6DA3C-2DB7-33B3-B925-C83D0C432B8E> /opt/homebrew/Cellar/macvim/9.2.0321/MacVim.app/Contents/MacOS/Vim
  Reason: tried: '/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file), '/opt/homebrew/opt/ruby@4.0/lib/libruby.4.0.dylib' (no such file)

Vim and MacVim configuration where issue is reproducable

No response

How was MacVim launched?

• by launching MacVim.app in macOS (by using the Dock, Spotlight, or the open command)
• by running mvim/gvim in the terminal

Issue has been tested with clean configuration

• by running mvim --clean (or gvim, supplied by MacVim distribution). You can also use the File → "New Clean Window" menu item within MacVim.
• by running vim --clean (in terminal, supplied by MacVim distribution)
• by running vim --clean (in terminal, other suppliers, e.g. /usr/bin/vim)