My uncle of French nationality lives abroad. He wants to help me finance the acquisition of my home by giving me money. Do I have to declare this operation in France ?

Yes. When the beneficiary of a donation is domiciled in France on the day of the donation or has had his tax residence in France for at least six years during the last ten years preceding the donation, all the assets he receives located in France or outside France are taxable in France (art. 750 TER, 3° CGI).