I saw that Chiwetel Ejiofor directed a movie called “The Boy Who Harnessed the Wind”. At first I wondered if it’s a remake from a movie I vaguely remember. It is not.

On to the movie I can’t seem to find:

Two boys are stranded in the desert. (Plane crash? or are they abandoned?)
After initial despair, they find a half buried sail boat, and scrap it together putting wheels on it, so they can “sail” across the desert.

I saw this in my childhood / early teens, so late 1990s, early 2000s, on Austrian television, or German cable. It was dubbed to German, but given the setting of Africa?, there’s every chance it’s a French production.

Please help me find this movie!