Arnold is a CPC emulator written and maintained by Kevin Thacker.

https://www.cpcwiki.eu/index.php/Arnold_(Emulator)

To build on macOS, install the dependencies using Homebrew.

brew install cmake wxwidgets

Note that wxwidgets 3.1.4 or later is required to build on Big Sur, due to some dylib problems with (at least) version 3.0.5.

Download the latest SDL2 Runtime Binaries from https://www.libsdl.org/download-2.0.php and copy the SDL2.framework folder using the Finder (this ensures that you preserve symlinks). Arnold is known to compile with SDL2 2.0.14.

Then we can build the app:

cd src
./make_mac.sh

If there are SDL2-related issues, check whether you have an older version of SDL installed in /Library/Framework/SDL2.framework. Download a new version and replace it as above.

Then to codesign the binary:

codesignidentity="Developer ID Application: Your Company"
codesign -v -s "$codesignidentity" --timestamp --deep --force --options=runtime,hard,kill ../exe/Release/arnold/arnold.app

Note that we must use force in order to replace codesigning on some of the frameworks.

Then to notarize the binary (assuming you're setup with Apple Developer certificates, otherwise see https://developer.apple.com/documentation/xcode/notarizing_macos_software_before_distribution):

First, you need to setup your credentials once, replacing TEAMID and APPLEID:

xcrun notarytool store-credentials --team-id TEAMID --apple-id APPLEID Arnold

Then, each time you want to notarize the arnold.zip file:

xcrun notarytool submit --keychain-profile Arnold --progress --wait arnold.zip
xcrun stapler staple ../exe/Release/arnold/arnold.app
rm arnold.zip