Cannot build simple Xcode8 macOS test application -- error while code signing

Hi,

I'm engaged in learning how to build a macOS desktop application using Xcode8 (under macOS 10.12), but when trying to build & run the a simple test application consisting merely of the stock files available when creating a new Xcode Cocoa Application project, the build fails with an error message, reading

//Volumes/mynasafpvolume/Develop/Xcode/DerivedData/Storyboard-ccqbhlfdkexootagid jmykwfcswf/Build/Products/Debug/Storyboard.app/Contents/Frameworks/libswiftAppKi t.dylib: resource fork, Finder information, or similar detritus not allowed

error: Task failed with exit 1 signal 0 {

/usr/bin/codesign '--force' '--sign' '<somehex>' '--verbose' '/Volumes/mynasafpvolume/Develop/Xcode/DerivedData/Storyboard-ccqbhlfdkexootagidjmykwfcswf/Build/Product s/Debug/Storyboard.app/Contents/Frameworks/libswiftAppKit.dylib'

}

Manually copying 'libswiftAppKit.dylib' from the Xcode directory to the project one, and executing

/usr/bin/codesign '--force' '--sign' '<somehex>' '--verbose' './libswiftAppKit.dylib'

leads to the identical result

./libswiftAppKit.dylib: replacing existing signature

./libswiftAppKit.dylib: resource fork, Finder information, or similar detritus not allowed

The project is residing on an AFP-mounted NAS volume, coming along with some niceties like being unable to use git there. 😟

How best to resolve this one?

-- MMHein