installing on MacOS with nix fails because lnav pulls in gpm as a dpenendency

[mg]

v0.12.3

Describe the bug
Installing lnav on MacOS using nix fails because latest version of lnav pulls in gpm (https://www.nico.schottelius.org/software/gpm/) as a dependency on MacOS.

To Reproduce
Steps to reproduce the behavior:
On a MacOS nix system try to install it in a nix shell
nix-shell -p lnav

output:

error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:34:12:
           33|
           34|   strict = derivationStrict drvAttrs;
             |            ^
           35|

       … while evaluating derivation 'shell'
         whose name attribute is located at /nix/store/5l2a0zjirsdyd87wxbvb9jf1g99dayy1-nixpkgs/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:336:7

       … while evaluating attribute 'buildInputs' of derivation 'shell'
         at /nix/store/5l2a0zjirsdyd87wxbvb9jf1g99dayy1-nixpkgs/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:383:7:
          382|       depsHostHost                = elemAt (elemAt dependencies 1) 0;
          383|       buildInputs                 = elemAt (elemAt dependencies 1) 1;
             |       ^
          384|       depsTargetTarget            = elemAt (elemAt dependencies 2) 0;

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: Package ‘gpm-unstable-2020-06-17’ in /nix/store/5l2a0zjirsdyd87wxbvb9jf1g99dayy1-nixpkgs/nixpkgs/pkgs/servers/gpm/default.nix:60 is not available on the requested hostPlatform:
         hostPlatform.config = "aarch64-apple-darwin"
         package.meta.platforms = [
           "aarch64-linux"
           "armv5tel-linux"
           "armv6l-linux"
           "armv7a-linux"
           "armv7l-linux"
           "i686-linux"
           "loongarch64-linux"
           "m68k-linux"
           "microblaze-linux"
           "microblazeel-linux"
           "mips-linux"
           "mips64-linux"
           "mips64el-linux"
           "mipsel-linux"
           "powerpc64-linux"
           "powerpc64le-linux"
           "riscv32-linux"
           "riscv64-linux"
           "s390-linux"
           "s390x-linux"
           "x86_64-linux"
           "i686-cygwin"
           "x86_64-cygwin"
         ]
         package.meta.badPlatforms = [ ]
       , refusing to evaluate.

       a) To temporarily allow packages that are unsupported for this system, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

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

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

[CharlesChiuGit]

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