How to setup autocompletion for CMake files?

[Wanpaku]

I don't understand how to setup autocompletion for CMake files.
Here is my ALEInfo:

Current Filetype: cmake
Available Linters: ['cmake_lint', 'cmakelint']
  Enabled Linters: ['cmake_lint', 'cmakelint']
  Ignored Linters: []
 Suggested Fixers:
  'cmakeformat' - Fix CMake files with cmake-format.
  'remove_trailing_lines' - Remove all blank lines at the end of a file.
  'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
 
 Linter Variables:
" Press Space to read :help for a setting
let g:ale_cmake_cmake_lint_executable = 'cmake-lint'
let g:ale_cmake_cmake_lint_options = ''
let g:ale_cmake_cmakelint_executable = 'cmakelint'
let g:ale_cmake_cmakelint_options = ''
 
 Global Variables:
" Press Space to read :help for a setting
let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = v:null
let g:ale_completion_delay = 100
let g:ale_completion_enabled = 1
let g:ale_completion_max_suggestions = 50
let g:ale_disable_lsp = 'auto'
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 1
let g:ale_fixers = {'cmake': ['cmakeformat'], 'cpp': ['clang-format']}
let g:ale_history_enabled = 1
let g:ale_info_default_mode = 'preview'
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'normal'
let g:ale_linter_aliases = {}
let g:ale_linters = {'rust': ['analyzer'], 'cpp': ['cc', 'gcc', 'clang', 'ccls', 'clangcheck', 'clangd', 'clangtidy', 'clazy', 'cppcheck', 'cpplint', 'cquery', 'cspell', 'flawfinder']}
let g:ale_linters_explicit = 0
let g:ale_linters_ignore = {}
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = {'\.h$': {'ale_linters': {'cpp': ['cc', 'gcc', 'clang']}}}
let g:ale_pattern_options_enabled = 1
let g:ale_root = {}
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = 'E'
let g:ale_sign_info = 'I'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = 'E'
let g:ale_sign_style_warning = 'W'
let g:ale_sign_warning = 'W'
let g:ale_sign_highlight_linenrs = 0
let g:ale_type_map = {}
let g:ale_use_neovim_diagnostics_api = 0
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 'all'
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
 
  Command History:

(executable check - failure) cmake-lint
(executable check - failure) cmakelint