Visa requirements fact from Gabon to Turkey

All kinds of applications for Turkish visas will have to be made through the Pre-Application System of Turkish Sticker Visa (www.visa.gov.tr).
Data required for visa applications will be uploaded to the system by the applicants. Following the online application, the applicants should apply to the Turkish Missions to complete the procedures including submission of their visa application forms duly signed and their passports as well as original copies of the application documents that have been already uploaded on the system.

https://www.evisa.gov.tr/en/

Ordinary passport holder citizens of Gabon are required to obtain visas to enter Turkey. Ordinary passport holders may get their visas on the condition that they meet certain conditions via the website. Diplomatic, service, and official passport holder citizens of Gabon are exempted from visas up to 90 days in any 180-day period.

For visit up to 30 days.

Source of information:
https://www.mfa.gov.tr/visa-information-for-foreigners.en.mfa

source of embassy:
http://librevil.be.mfa.gov.tr/Mission

Source of e-visa and visa on arrival fees:
https://www.mfa.gov.tr/data/KONSOLOSLUK/e-visa-fees-en-31-december.pdf