[nix Mac OS X Sierra 10.12.4] mu-0.9.18 cannot install due to pmccabe-2.6 error

[ag91]

Issue description

Hello,

Huge thanks for contributing to nix! I am trying to use this great package manager with a Mac, and I am having some issues trying to install my favourite email client.

Steps to reproduce

When I try to install mu with nix-env -I mu, I get the following error:

installing ‘mu-0.9.18’
error: Package ‘pmccabe-2.6’ in ‘/nix/store/p95wisxzddaqm41921jg1x9imwfai5jv-nixpkgs-17.09pre104948.c34db6e419/nixpkgs/pkgs/development/tools/misc/pmccabe/default.nix:25’ is not supported on ‘x86_64-darwin’, refusing to evaluate.

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowBroken = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowBroken = true; }
to ~/.config/nixpkgs/config.nix.

(use ‘--show-trace’ to show detailed location information)

Technical details

I checked the pmccabe derivation, and it has indeed a constraint on the platform: platforms = platforms.linux;.
Any way this derivation can work on Mac OS X x64?
Thanks,

Andrea

• System: Mac OS X Sierra 10.12.4
• Nix version: 1.11.8
• Nixpkgs version: 17.09pre104948.c34db6e419

[LnL7]

It seems the pmccabe dependency is not used or at least optional, this builds fine without it.

mu.override { pmccabe = null; }

[joachifm]

cc @peterhoeg added it, I think. iirc, that dep is for the test suite.

[peterhoeg]

This isn't the first time I'm breaking the build on Darwin. How do other people test properly without access to a mac?

[ag91]

Thanks, this works!

…

On Tue 04 Apr 2017 at 20:59, Daiderd Jordan ***@***.***> wrote: It seems the pmccabe dependency is not used or at least optional, this builds fine without it. mu.override { pmccabe = null; } — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[LnL7]

@peterhoeg You can use nix-instantiate --argstr system x86_64-darwin to check evaluation for darwin or other platforms. That should catch simple cases like this if you don't have allowBroken enabled in your config.

[peterhoeg]

Thanks for the pointer @LnL7. I think the trick is to get darwin running in a VM instead...