The linter checkmate/makefile is not installing?

[rickalex21]

Hello,

For some reason the linter checkmate is not installing. I have also tried makefile.

I have tried:

:MasonInstall checkmate

I get these errors:

mason.nvim ERROR "checkmate" is not a valid package. 
mason.nvim ERROR "makefile" is not a valid package. 

Here is my LazyVim plugin:

return {
  "williamboman/mason.nvim",
  opts = function(_, opts)
    vim.list_extend(opts.ensure_installed, {
      "json-lsp", -- use ft=jsonc to avoid comment errors.
      "css-lsp",
      "nil", -- requires cargo
      "bash-language-server",
      "shellcheck",
     "checkmate",
    })

    opts.ui = {
      border = "rounded",
    }
  end,
}

Error:

mason-registry/init.lua:80: Cannot find package "checkmate".  

For now I have been working with the defaults for Makefiles.