OMG, getting futhark installed was easy when I just did this: nimble install futhark --passL:"\"-L$(xcode-select --print-path)/usr/lib\"" Run
The final suggestion in the thread did not work, though: nimble install futhark --passL:'"-L$(xcode-select --print-path)/Toolchains/XcodeDefault.xctoolchain/usr/lib/"' Run