mono5

GC Warning: Failed to expand heap by 4194304 KiB
error:
       … while evaluating attribute 'drv'
         at /nix/store/0777j7gpy2m0c4jr067kak90n40rg2aa-filnix-experiment-0.8.0/lib/experiment/planner.nix:14:3:
           13| {
           14|   drv = p.drvPath;
             |   ^
           15|   name = p.name;

       … while evaluating the attribute 'drvPath'
         at /nix/store/b2r7qcsiwrp1kjhbgxw3n089lbz2swsn-source/lib/customisation.nix:418:7:
          417|     // {
          418|       drvPath =
             |       ^
          419|         assert condition;

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

       error: Package ‘mono-5.20.1.34’ in /nix/store/b2r7qcsiwrp1kjhbgxw3n089lbz2swsn-source/pkgs/development/compilers/mono/generic.nix:117 is marked as insecure, refusing to evaluate.


       Known issues:
        - mono was archived upstream, see https://www.mono-project.com/
       While WineHQ has taken over development, consider using 6.14.0 or newer.


       You can install it anyway by allowing this package, using the
       following methods:

       a) To temporarily allow all insecure packages, you can use an environment
          variable for a single invocation of the nix tools:

            $ export NIXPKGS_ALLOW_INSECURE=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 add ‘mono-5.20.1.34’ to
          `nixpkgs.config.permittedInsecurePackages` in the configuration.nix,
          like so:

            {
              nixpkgs.config.permittedInsecurePackages = [
                "mono-5.20.1.34"
              ];
            }

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
          ‘mono-5.20.1.34’ to `permittedInsecurePackages` in
          ~/.config/nixpkgs/config.nix, like so:

            {
              permittedInsecurePackages = [
                "mono-5.20.1.34"
              ];
            }