configureFlags must be a list in newer nixpkgs

[considerate]

When compiling against the musl ABI with isStatic = true the following line throws an error because configureFlags is assumed to be a list:
https://github.com/NixOS/nixpkgs/blob/7cd9f4e83350c564bb3c0a2da80677d97cef5d4c/pkgs/stdenv/adapters.nix#L66

[michaelpj]

Do we need a conditional for older versions of nixpkgs, or does this work on old versions too?

[considerate]

Do we need a conditional for older versions of nixpkgs, or does this work on old versions too?

As far as I can tell the older versions should be able to use the list. A git grep 'configureFlags = [' on the nixos-18.09 branch of nixpkgs results in a lot of hits. If not I thought CI would catch it (provided that it would run on all versions since 21.05).

I don't really know how to go about testing if it is explicitly required to pass a plain list in earlier versions of nixpkgs other than just trying to build with them.

[hamishmack]

bors try

[iohk-bors]

try

Build failed:

• buildkite/haskell-dot-nix