Thanks. The following runs successfully on my Mac Book Pro:

$(nix-build -A haskellPackages.futhark)/bin/futhark --version
Futhark 0.8.1
git: UNKNOWN @ UNKNOWN (UNKNOWN)
Copyright (C) DIKU, University of Copenhagen, released under the ISC license.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Can it compile anything on Darwin though? Just run through the first example on https://futhark-lang.org/examples.html

And what was the error on Darwin?

Works for me with the OpenCL backend. Keep in mind you need to pass arguments on stdin.

Odd, because the wrapping thing is not present at all on Darwin now, no idea how it can still work.

I don't know what you mean, can you elaborate?

The line in this PR makes it such that on Darwin it uses the unwrapped Futhark package. The wrapping logic under that line will only be applied on non-Darwin. And I added that logic down there to make compiling work, because it didn't work if it wasn't wrapped properly.

Have you tried it on Darwin? What's the error?

Um, I thought you were on Darwin, because I asked earlier whether it worked on Darwin and you replied that it does..

I'm on Darwin and it does work for me, I was just asking if it was different for you.

The wrapper isn't needed on Darwin. There's no ocl-icd and everything should be available through OpenCL.framework.

Oh I see, no I'm not on darwin.

@jacereda Do you have gcc or clang in your PATH though? Because that's another thing the wrapper does for you. Try compiling a Futhark program with export PATH="" beforehand

It's finding impure dependencies, it will run if you leave /usr/bin in the path.

Yeah but we don't want impure dependencies in Nix. If somebody doesn't have gcc/clang installed, the program should still run.