Bad CPU type in executable
This time I bought a new macbook Pro M4 to replace old macbook Pro intel 2018.
After finishing the migration, I tried to open iOS project with Tuist.
mise x -- tuist generate
However I encountered this error
-bash: /usr/local/bin/mise: Bad CPU type in executable
I guessed it was caused the mise installed for Intel and attempted to reinstall mise using brew.
brew install mise
The brew also didn’t work.
/usr/local/Homebrew/Library/Homebrew/brew.sh: line 1018: /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby: Bad CPU type in executable
Ruby
According to the error message, the root reason might be ruby.
I check the version of ruby.
ruby --version
The command was failed, but I could get the version string.
-bash: /usr/local/Cellar/ruby/3.3.0/bin/ruby: Bad CPU type in executable
Gem
I wanted to uninstall ruby 3.3.0 if it is installed with gem.
sudo gem uninstall ruby -v 3.3.0
gem was also unavailble.
sudo: unable to execute /usr/local/Cellar/ruby/3.3.0/bin/gem: Bad CPU type in executable
Uninstalling Homebrew
I ran the command from brew site with uninstall.sh intead of install.sh.
/bin/bash -c “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
Then It will warn you
Are you sure you want to uninstall Homebrew? This will remove your installed packages!
So you should check first if it is installed packages.
And I ran install.sh command this time.
/bin/bash -c “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
It seemed like failed due to the last message.
Failed during: /opt/homebrew/bin/brew update — force — quiet
I just ran it again and no more the failed message.
To allow run brew on Terminal, I followed the instruction.
echo >> /Users/LYJ/.bash_profile
echo ‘eval “$(/opt/homebrew/bin/brew shellenv)”’ >> /Users/LYJ/.bash_profile
eval “$(/opt/homebrew/bin/brew shellenv)”
After installing brew, I checked also ruby.
ruby -- version
It was lower than 3.3.0.
ruby 2.6.10p210 (2022–04–12 revision 67958) [universal.arm64e-darwin24]
So I installed ruby version 3.3.0 manually.
sudo gem install ruby -v 3.3.0
However gem couldn’t find ruby ‘3.3.0’
ERROR: Could not find a valid gem ‘ruby’ (= 3.3.0) in any repository
I tried to install ruby again with brew.
brew install rbenv
brew install ruby@3.3.0
It showed other versions.
There was 3.3 instead of 3.3.0.
brew install ruby@3.3
After registering ruby on environment.
echo ‘export PATH=”/opt/homebrew/opt/ruby@3.3/bin:$PATH”’ >> /Users/LYJ/.bash_profile
I could see ruby version.
ruby --version
ruby 3.3.8 (2025–04–09 revision b200bad6cd) [arm64-darwin24]
Now mise installation works.
brew install mise
And I can Tuist now!
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