None of the teams who have qualified for this year's World Cup has won a game yet, with Cameroon, Algeria and Nigeria losing their opening matches and Ivory Coast being held to a draw.
Ghana play their first game in the tournament on Friday against Ivory Coast in Group B.
Cameroon, who pipped Gabon in the race to a World Cup spot last November by finishing ahead of their neighbours in African qualifying, take on Zambia and Gabon face Tunisia in the group's next match day on Sunday.
Inter Milan striker Samuel Eto'o, who is looking to set a new scoring record at a single Nations Cup, failed to live up to expectations and was barely a threat to the Gabon defence.
Gabon could have made it 2-0 in stoppage time but Willy Aubameyang's 30-metre free kick smashed the bar and bounced out in front of Idriss Carlos Kameni's line.
"It does not write off our two defeats (against Cameroon in the World Cup qualifiers). You do not play to try and change the past," he said.
"We had set up a tactical frame to counter Cameroon's game and it worked out."
