Function g_key_file_load_unix_configurations 

pub unsafe extern "C" fn g_key_file_load_unix_configurations(
    key_file: *mut GKeyFile,
    project: *const c_char,
    etc_subdir: *const c_char,
    run_subdir: *const c_char,
    usr_subdir: *const c_char,
    config_name: *const c_char,
    config_suffix: *const c_char,
    flags: GKeyFileFlags,
    error: *mut *mut GError,
) -> gboolean

Available on crate feature v2_90 only.