Mr Buhari made the disclosure on his verified Twitter handle, @MBuhari, on Thursday.
According to the President, the approval was in line with his administration’s goal of improving on infrastructures across the country.
He wrote: “I have approved the sum of 10 billion Naira for an intervention fund for the upgrade of the Akanu Ibiam International Airport, Enugu.
“I have the assurance of the Minister of Aviation that the work will be done speedily and to the highest standards.
“Even as we have many items competing for our limited resources, we will continue to prioritize infrastructure investments in every part of the country.
“It is our responsibility to ensure Nigeria’s infrastructure is fixed; we will keep doing this.”