anchor.diff:  }:
   
   let
  -  inherit (lib) concatStringsSep mapAttrsToList;
  +  inherit (lib) concatStringsSep concatMap id mapAttrsToList;
   in
   buildGoModule rec {
     pname = "pomerium";
  
positive.code:   ldflags = let
      # Set a variety of useful meta variables for stamping the build with.
      setVars = {
        Version = "v${version}";
        BuildMeta = "nixpkgs";
        ProjectName = "pomerium";
        ProjectURL = "github.com/pomerium/pomerium";
      };
      varFlags = concatStringsSep " " (mapAttrsToList (name: value: "-X github.com/pomerium/pomerium/internal/version.${name}=${value}") setVars);
    in [
      "${varFlags}"
    ];
  
    preBuild = ''
      rm internal/envoy/files/files_{darwin,linux}*.go
      cat <<EOF >internal/envoy/files/files_generic.go
      package files
  
      import _ "embed" // embed
  
      //go:embed envoy
      var rawBinary []byte
  
      //go:embed envoy.sha256
  
negative.code:     //go:embed envoy.version
      var rawVersion string
      EOF
      sha256sum '${envoy}/bin/envoy' > internal/envoy/files/envoy.sha256
      echo '${envoy.version}' > internal/envoy/files/envoy.version
    '';
  
    installPhase = ''
      install -Dm0755 $GOPATH/bin/pomerium $out/bin/pomerium
  