Hello, there is a master topic being used for missing airports. You may be interested in this here:
This is a list used by the community to keep track of any missing airports reported to Zendesk. Looks like Makokou has already been noted as missing by another community member:
You can also check this list before reporting. If not listed, you can file a Zendesk ticket and post to the topic linked above with the missing airport and coordinates.